x^2-13x-21=-7x-5

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Solution for x^2-13x-21=-7x-5 equation: 


Simplifying
x2 + -13x + -21 = -7x + -5

Reorder the terms:
-21 + -13x + x2 = -7x + -5

Reorder the terms:
-21 + -13x + x2 = -5 + -7x

Solving
-21 + -13x + x2 = -5 + -7x

Solving for variable 'x'.

Reorder the terms:
-21 + 5 + -13x + 7x + x2 = -5 + -7x + 5 + 7x

Combine like terms: -21 + 5 = -16
-16 + -13x + 7x + x2 = -5 + -7x + 5 + 7x

Combine like terms: -13x + 7x = -6x
-16 + -6x + x2 = -5 + -7x + 5 + 7x

Reorder the terms:
-16 + -6x + x2 = -5 + 5 + -7x + 7x

Combine like terms: -5 + 5 = 0
-16 + -6x + x2 = 0 + -7x + 7x
-16 + -6x + x2 = -7x + 7x

Combine like terms: -7x + 7x = 0
-16 + -6x + x2 = 0

Factor a trinomial.
(-2 + -1x)(8 + -1x) = 0


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

Simplifying
-2 + -1x = 0

Solving
-2 + -1x = 0

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

Add '2' to each side of the equation.
-2 + 2 + -1x = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1x = 0 + 2
-1x = 0 + 2

Combine like terms: 0 + 2 = 2
-1x = 2

Divide each side by '-1'.
x = -2

Simplifying
x = -2

Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve:

Simplifying
8 + -1x = 0

Solving
8 + -1x = 0

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

Add '-8' to each side of the equation.
8 + -8 + -1x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1x = 0 + -8
-1x = 0 + -8

Combine like terms: 0 + -8 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8
Solution
x = {-2, 8}

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