120+3x+x=180

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Solution for 120+3x+x=180 equation: 


Simplifying
120 + 3x + x = 180

Combine like terms: 3x + x = 4x
120 + 4x = 180

Solving
120 + 4x = 180

Solving for variable 'x'.

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

Add '-120' to each side of the equation.
120 + -120 + 4x = 180 + -120

Combine like terms: 120 + -120 = 0
0 + 4x = 180 + -120
4x = 180 + -120

Combine like terms: 180 + -120 = 60
4x = 60

Divide each side by '4'.
x = 15

Simplifying
x = 15

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