90+39+X=180

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Solution for 90+39+X=180 equation: 


Simplifying
90 + 39 + X = 180

Combine like terms: 90 + 39 = 129
129 + X = 180

Solving
129 + X = 180

Solving for variable 'X'.

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

Add '-129' to each side of the equation.
129 + -129 + X = 180 + -129

Combine like terms: 129 + -129 = 0
0 + X = 180 + -129
X = 180 + -129

Combine like terms: 180 + -129 = 51
X = 51

Simplifying
X = 51

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