4x^2-21x+42=6x+7

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Solution for 4x^2-21x+42=6x+7 equation: 


Simplifying
4x2 + -21x + 42 = 6x + 7

Reorder the terms:
42 + -21x + 4x2 = 6x + 7

Reorder the terms:
42 + -21x + 4x2 = 7 + 6x

Solving
42 + -21x + 4x2 = 7 + 6x

Solving for variable 'x'.

Reorder the terms:
42 + -7 + -21x + -6x + 4x2 = 7 + 6x + -7 + -6x

Combine like terms: 42 + -7 = 35
35 + -21x + -6x + 4x2 = 7 + 6x + -7 + -6x

Combine like terms: -21x + -6x = -27x
35 + -27x + 4x2 = 7 + 6x + -7 + -6x

Reorder the terms:
35 + -27x + 4x2 = 7 + -7 + 6x + -6x

Combine like terms: 7 + -7 = 0
35 + -27x + 4x2 = 0 + 6x + -6x
35 + -27x + 4x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
35 + -27x + 4x2 = 0

Factor a trinomial.
(7 + -4x)(5 + -1x) = 0


Subproblem 1
Set the factor '(7 + -4x)' equal to zero and attempt to solve:

Simplifying
7 + -4x = 0

Solving
7 + -4x = 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 + -4x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -4x = 0 + -7
-4x = 0 + -7

Combine like terms: 0 + -7 = -7
-4x = -7

Divide each side by '-4'.
x = 1.75

Simplifying
x = 1.75

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

Simplifying
5 + -1x = 0

Solving
5 + -1x = 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 + -1x = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -1x = 0 + -5
-1x = 0 + -5

Combine like terms: 0 + -5 = -5
-1x = -5

Divide each side by '-1'.
x = 5

Simplifying
x = 5
Solution
x = {1.75, 5}

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