x^2-21x+9=-8x-3

Solution for x^2-21x+9=-8x-3 equation:

Simplifying
x2 + -21x + 9 = -8x + -3

Reorder the terms:
9 + -21x + x2 = -8x + -3

Reorder the terms:
9 + -21x + x2 = -3 + -8x

Solving
9 + -21x + x2 = -3 + -8x

Solving for variable 'x'.

Reorder the terms:
9 + 3 + -21x + 8x + x2 = -3 + -8x + 3 + 8x

Combine like terms: 9 + 3 = 12
12 + -21x + 8x + x2 = -3 + -8x + 3 + 8x

Combine like terms: -21x + 8x = -13x
12 + -13x + x2 = -3 + -8x + 3 + 8x

Reorder the terms:
12 + -13x + x2 = -3 + 3 + -8x + 8x

Combine like terms: -3 + 3 = 0
12 + -13x + x2 = 0 + -8x + 8x
12 + -13x + x2 = -8x + 8x

Combine like terms: -8x + 8x = 0
12 + -13x + x2 = 0

Factor a trinomial.
(1 + -1x)(12 + -1x) = 0

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

Simplifying
1 + -1x = 0

Solving
1 + -1x = 0

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

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

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

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

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

Simplifying
x = 1
Subproblem 2
Set the factor '(12 + -1x)' equal to zero and attempt to solve:

Simplifying
12 + -1x = 0

Solving
12 + -1x = 0

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

Add '-12' to each side of the equation.
12 + -12 + -1x = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -1x = 0 + -12
-1x = 0 + -12

Combine like terms: 0 + -12 = -12
-1x = -12

Divide each side by '-1'.
x = 12

Simplifying
x = 12
Solution
x = {1, 12}