-21+12x=9x+18

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Solution for -21+12x=9x+18 equation:


Simplifying
-21 + 12x = 9x + 18

Reorder the terms:
-21 + 12x = 18 + 9x

Solving
-21 + 12x = 18 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
-21 + 12x + -9x = 18 + 9x + -9x

Combine like terms: 12x + -9x = 3x
-21 + 3x = 18 + 9x + -9x

Combine like terms: 9x + -9x = 0
-21 + 3x = 18 + 0
-21 + 3x = 18

Add '21' to each side of the equation.
-21 + 21 + 3x = 18 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 18 + 21
3x = 18 + 21

Combine like terms: 18 + 21 = 39
3x = 39

Divide each side by '3'.
x = 13

Simplifying
x = 13

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