X+21=x-18

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Solution for X+21=x-18 equation: 


Simplifying
X + 21 = x + -18

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

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

Solving
21 + X = -18 + x

Solving for variable 'X'.

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

Add '-21' to each side of the equation.
21 + -21 + X = -18 + -21 + x

Combine like terms: 21 + -21 = 0
0 + X = -18 + -21 + x
X = -18 + -21 + x

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

Simplifying
X = -39 + x

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