3x+15+9x+21=180

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Solution for 3x+15+9x+21=180 equation:


Simplifying
3x + 15 + 9x + 21 = 180

Reorder the terms:
15 + 21 + 3x + 9x = 180

Combine like terms: 15 + 21 = 36
36 + 3x + 9x = 180

Combine like terms: 3x + 9x = 12x
36 + 12x = 180

Solving
36 + 12x = 180

Solving for variable 'x'.

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

Add '-36' to each side of the equation.
36 + -36 + 12x = 180 + -36

Combine like terms: 36 + -36 = 0
0 + 12x = 180 + -36
12x = 180 + -36

Combine like terms: 180 + -36 = 144
12x = 144

Divide each side by '12'.
x = 12

Simplifying
x = 12

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