x^2-5x+21=2x+9

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Solution for x^2-5x+21=2x+9 equation: 


Simplifying
x2 + -5x + 21 = 2x + 9

Reorder the terms:
21 + -5x + x2 = 2x + 9

Reorder the terms:
21 + -5x + x2 = 9 + 2x

Solving
21 + -5x + x2 = 9 + 2x

Solving for variable 'x'.

Reorder the terms:
21 + -9 + -5x + -2x + x2 = 9 + 2x + -9 + -2x

Combine like terms: 21 + -9 = 12
12 + -5x + -2x + x2 = 9 + 2x + -9 + -2x

Combine like terms: -5x + -2x = -7x
12 + -7x + x2 = 9 + 2x + -9 + -2x

Reorder the terms:
12 + -7x + x2 = 9 + -9 + 2x + -2x

Combine like terms: 9 + -9 = 0
12 + -7x + x2 = 0 + 2x + -2x
12 + -7x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
12 + -7x + x2 = 0

Factor a trinomial.
(3 + -1x)(4 + -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 '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

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

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {3, 4}

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