3x-12=21+6x

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Solution for 3x-12=21+6x equation:


Simplifying
3x + -12 = 21 + 6x

Reorder the terms:
-12 + 3x = 21 + 6x

Solving
-12 + 3x = 21 + 6x

Solving for variable 'x'.

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

Add '-6x' to each side of the equation.
-12 + 3x + -6x = 21 + 6x + -6x

Combine like terms: 3x + -6x = -3x
-12 + -3x = 21 + 6x + -6x

Combine like terms: 6x + -6x = 0
-12 + -3x = 21 + 0
-12 + -3x = 21

Add '12' to each side of the equation.
-12 + 12 + -3x = 21 + 12

Combine like terms: -12 + 12 = 0
0 + -3x = 21 + 12
-3x = 21 + 12

Combine like terms: 21 + 12 = 33
-3x = 33

Divide each side by '-3'.
x = -11

Simplifying
x = -11

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