3x-9+x+21=180

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


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

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

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

Combine like terms: 3x + x = 4x
12 + 4x = 180

Solving
12 + 4x = 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 + 4x = 180 + -12

Combine like terms: 12 + -12 = 0
0 + 4x = 180 + -12
4x = 180 + -12

Combine like terms: 180 + -12 = 168
4x = 168

Divide each side by '4'.
x = 42

Simplifying
x = 42

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