-21=5x+7-2x+8

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Solution for -21=5x+7-2x+8 equation:


Simplifying
-21 = 5x + 7 + -2x + 8

Reorder the terms:
-21 = 7 + 8 + 5x + -2x

Combine like terms: 7 + 8 = 15
-21 = 15 + 5x + -2x

Combine like terms: 5x + -2x = 3x
-21 = 15 + 3x

Solving
-21 = 15 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-21 + -3x = 15 + 3x + -3x

Combine like terms: 3x + -3x = 0
-21 + -3x = 15 + 0
-21 + -3x = 15

Add '21' to each side of the equation.
-21 + 21 + -3x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + -3x = 15 + 21
-3x = 15 + 21

Combine like terms: 15 + 21 = 36
-3x = 36

Divide each side by '-3'.
x = -12

Simplifying
x = -12

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