120+78+15+x=180

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Solution for 120+78+15+x=180 equation: 


Simplifying
120 + 78 + 15 + x = 180

Combine like terms: 120 + 78 = 198
198 + 15 + x = 180

Combine like terms: 198 + 15 = 213
213 + x = 180

Solving
213 + x = 180

Solving for variable 'x'.

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

Add '-213' to each side of the equation.
213 + -213 + x = 180 + -213

Combine like terms: 213 + -213 = 0
0 + x = 180 + -213
x = 180 + -213

Combine like terms: 180 + -213 = -33
x = -33

Simplifying
x = -33

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