3x+21+6x-12=180

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Solution for 3x+21+6x-12=180 equation:


Simplifying
3x + 21 + 6x + -12 = 180

Reorder the terms:
21 + -12 + 3x + 6x = 180

Combine like terms: 21 + -12 = 9
9 + 3x + 6x = 180

Combine like terms: 3x + 6x = 9x
9 + 9x = 180

Solving
9 + 9x = 180

Solving for variable 'x'.

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

Add '-9' to each side of the equation.
9 + -9 + 9x = 180 + -9

Combine like terms: 9 + -9 = 0
0 + 9x = 180 + -9
9x = 180 + -9

Combine like terms: 180 + -9 = 171
9x = 171

Divide each side by '9'.
x = 19

Simplifying
x = 19

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