15+42+X=88

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Solution for 15+42+X=88 equation: 


Simplifying
15 + 42 + X = 88

Combine like terms: 15 + 42 = 57
57 + X = 88

Solving
57 + X = 88

Solving for variable 'X'.

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

Add '-57' to each side of the equation.
57 + -57 + X = 88 + -57

Combine like terms: 57 + -57 = 0
0 + X = 88 + -57
X = 88 + -57

Combine like terms: 88 + -57 = 31
X = 31

Simplifying
X = 31

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