3x(2x+5)+4(2x+5)=

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Solution for 3x(2x+5)+4(2x+5)= equation: 


Simplifying
3x(2x + 5) + 4(2x + 5) = 0

Reorder the terms:
3x(5 + 2x) + 4(2x + 5) = 0
(5 * 3x + 2x * 3x) + 4(2x + 5) = 0
(15x + 6x2) + 4(2x + 5) = 0

Reorder the terms:
15x + 6x2 + 4(5 + 2x) = 0
15x + 6x2 + (5 * 4 + 2x * 4) = 0
15x + 6x2 + (20 + 8x) = 0

Reorder the terms:
20 + 15x + 8x + 6x2 = 0

Combine like terms: 15x + 8x = 23x
20 + 23x + 6x2 = 0

Solving
20 + 23x + 6x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(5 + 2x)(4 + 3x) = 0


Subproblem 1
Set the factor '(5 + 2x)' equal to zero and attempt to solve:

Simplifying
5 + 2x = 0

Solving
5 + 2x = 0

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

Add '-5' to each side of the equation.
5 + -5 + 2x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 2x = 0 + -5
2x = 0 + -5

Combine like terms: 0 + -5 = -5
2x = -5

Divide each side by '2'.
x = -2.5

Simplifying
x = -2.5

Subproblem 2
Set the factor '(4 + 3x)' equal to zero and attempt to solve:

Simplifying
4 + 3x = 0

Solving
4 + 3x = 0

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

Add '-4' to each side of the equation.
4 + -4 + 3x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 3x = 0 + -4
3x = 0 + -4

Combine like terms: 0 + -4 = -4
3x = -4

Divide each side by '3'.
x = -1.333333333

Simplifying
x = -1.333333333
Solution
x = {-2.5, -1.333333333}

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