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

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


Simplifying
x2 + -6x + 21 = 42 + -2x

Reorder the terms:
21 + -6x + x2 = 42 + -2x

Solving
21 + -6x + x2 = 42 + -2x

Solving for variable 'x'.

Reorder the terms:
21 + -42 + -6x + 2x + x2 = 42 + -2x + -42 + 2x

Combine like terms: 21 + -42 = -21
-21 + -6x + 2x + x2 = 42 + -2x + -42 + 2x

Combine like terms: -6x + 2x = -4x
-21 + -4x + x2 = 42 + -2x + -42 + 2x

Reorder the terms:
-21 + -4x + x2 = 42 + -42 + -2x + 2x

Combine like terms: 42 + -42 = 0
-21 + -4x + x2 = 0 + -2x + 2x
-21 + -4x + x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
-21 + -4x + x2 = 0

Factor a trinomial.
(-3 + -1x)(7 + -1x) = 0


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

Simplifying
-3 + -1x = 0

Solving
-3 + -1x = 0

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

Add '3' to each side of the equation.
-3 + 3 + -1x = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1x = 0 + 3
-1x = 0 + 3

Combine like terms: 0 + 3 = 3
-1x = 3

Divide each side by '-1'.
x = -3

Simplifying
x = -3

Subproblem 2
Set the factor '(7 + -1x)' equal to zero and attempt to solve:

Simplifying
7 + -1x = 0

Solving
7 + -1x = 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 + -1x = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 0 + -7
-1x = 0 + -7

Combine like terms: 0 + -7 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7
Solution
x = {-3, 7}

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