90+78+X=180

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Solution for 90+78+X=180 equation: 


Simplifying
90 + 78 + X = 180

Combine like terms: 90 + 78 = 168
168 + X = 180

Solving
168 + X = 180

Solving for variable 'X'.

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

Add '-168' to each side of the equation.
168 + -168 + X = 180 + -168

Combine like terms: 168 + -168 = 0
0 + X = 180 + -168
X = 180 + -168

Combine like terms: 180 + -168 = 12
X = 12

Simplifying
X = 12

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