3x+21+11x-9=180

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Solution for 3x+21+11x-9=180 equation:


Simplifying
3x + 21 + 11x + -9 = 180

Reorder the terms:
21 + -9 + 3x + 11x = 180

Combine like terms: 21 + -9 = 12
12 + 3x + 11x = 180

Combine like terms: 3x + 11x = 14x
12 + 14x = 180

Solving
12 + 14x = 180

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 14x = 180 + -12

Combine like terms: 12 + -12 = 0
0 + 14x = 180 + -12
14x = 180 + -12

Combine like terms: 180 + -12 = 168
14x = 168

Divide each side by '14'.
x = 12

Simplifying
x = 12

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