-18+X-21=72

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Solution for -18+X-21=72 equation: 


Simplifying
-18 + X + -21 = 72

Reorder the terms:
-18 + -21 + X = 72

Combine like terms: -18 + -21 = -39
-39 + X = 72

Solving
-39 + X = 72

Solving for variable 'X'.

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

Add '39' to each side of the equation.
-39 + 39 + X = 72 + 39

Combine like terms: -39 + 39 = 0
0 + X = 72 + 39
X = 72 + 39

Combine like terms: 72 + 39 = 111
X = 111

Simplifying
X = 111

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