-3+18+x=21

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Solution for -3+18+x=21 equation: 


Simplifying
-3 + 18 + x = 21

Combine like terms: -3 + 18 = 15
15 + x = 21

Solving
15 + x = 21

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + x = 21 + -15

Combine like terms: 15 + -15 = 0
0 + x = 21 + -15
x = 21 + -15

Combine like terms: 21 + -15 = 6
x = 6

Simplifying
x = 6

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