-21=2x+12-9

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Solution for -21=2x+12-9 equation:


Simplifying
-21 = 2x + 12 + -9

Reorder the terms:
-21 = 12 + -9 + 2x

Combine like terms: 12 + -9 = 3
-21 = 3 + 2x

Solving
-21 = 3 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
-21 + -2x = 3 + 2x + -2x

Combine like terms: 2x + -2x = 0
-21 + -2x = 3 + 0
-21 + -2x = 3

Add '21' to each side of the equation.
-21 + 21 + -2x = 3 + 21

Combine like terms: -21 + 21 = 0
0 + -2x = 3 + 21
-2x = 3 + 21

Combine like terms: 3 + 21 = 24
-2x = 24

Divide each side by '-2'.
x = -12

Simplifying
x = -12

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