5x+5+5x(2+3x)=30

Solution for 5x+5+5x(2+3x)=30 equation:

Simplifying
5x + 5 + 5x(2 + 3x) = 30
5x + 5 + (2 * 5x + 3x * 5x) = 30
5x + 5 + (10x + 15x2) = 30

Reorder the terms:
5 + 5x + 10x + 15x2 = 30

Combine like terms: 5x + 10x = 15x
5 + 15x + 15x2 = 30

Solving
5 + 15x + 15x2 = 30

Solving for variable 'x'.

Reorder the terms:
5 + -30 + 15x + 15x2 = 30 + -30

Combine like terms: 5 + -30 = -25
-25 + 15x + 15x2 = 30 + -30

Combine like terms: 30 + -30 = 0
-25 + 15x + 15x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-5 + 3x + 3x2) = 0

Ignore the factor 5.
Subproblem 1
Set the factor '(-5 + 3x + 3x2)' equal to zero and attempt to solve:

Simplifying
-5 + 3x + 3x2 = 0

Solving
-5 + 3x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-1.666666667 + x + x2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + x + 1.666666667 + x2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + x + x2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + x + x2 = 0 + 1.666666667
x + x2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
x + x2 = 1.666666667

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 1.666666667 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 1.666666667 + 0.25

Combine like terms: 1.666666667 + 0.25 = 1.916666667
1.25 + x2 = 1.916666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 1.916666667

Calculate the square root of the right side: 1.384437311

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.384437311 and -1.384437311.

Subproblem 1
x + 0.5 = 1.384437311

Simplifying
x + 0.5 = 1.384437311

Reorder the terms:
0.5 + x = 1.384437311

Solving
0.5 + x = 1.384437311

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = 1.384437311 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 1.384437311 + -0.5
x = 1.384437311 + -0.5

Combine like terms: 1.384437311 + -0.5 = 0.884437311
x = 0.884437311

Simplifying
x = 0.884437311

Subproblem 2
x + 0.5 = -1.384437311

Simplifying
x + 0.5 = -1.384437311

Reorder the terms:
0.5 + x = -1.384437311

Solving
0.5 + x = -1.384437311

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-0.5' to each side of the equation.
0.5 + -0.5 + x = -1.384437311 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -1.384437311 + -0.5
x = -1.384437311 + -0.5

Combine like terms: -1.384437311 + -0.5 = -1.884437311
x = -1.884437311

Simplifying
x = -1.884437311

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.884437311, -1.884437311}
Solution
x = {0.884437311, -1.884437311}