4x^2-21x+39=3x+4

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Solution for 4x^2-21x+39=3x+4 equation: 


Simplifying
4x2 + -21x + 39 = 3x + 4

Reorder the terms:
39 + -21x + 4x2 = 3x + 4

Reorder the terms:
39 + -21x + 4x2 = 4 + 3x

Solving
39 + -21x + 4x2 = 4 + 3x

Solving for variable 'x'.

Reorder the terms:
39 + -4 + -21x + -3x + 4x2 = 4 + 3x + -4 + -3x

Combine like terms: 39 + -4 = 35
35 + -21x + -3x + 4x2 = 4 + 3x + -4 + -3x

Combine like terms: -21x + -3x = -24x
35 + -24x + 4x2 = 4 + 3x + -4 + -3x

Reorder the terms:
35 + -24x + 4x2 = 4 + -4 + 3x + -3x

Combine like terms: 4 + -4 = 0
35 + -24x + 4x2 = 0 + 3x + -3x
35 + -24x + 4x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
35 + -24x + 4x2 = 0

Factor a trinomial.
(5 + -2x)(7 + -2x) = 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 '(7 + -2x)' equal to zero and attempt to solve:

Simplifying
7 + -2x = 0

Solving
7 + -2x = 0

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

Add '-7' to each side of the equation.
7 + -7 + -2x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -2x = 0 + -7
-2x = 0 + -7

Combine like terms: 0 + -7 = -7
-2x = -7

Divide each side by '-2'.
x = 3.5

Simplifying
x = 3.5
Solution
x = {2.5, 3.5}

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