21+x=18

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Solution for 21+x=18 equation: 


Simplifying
21 + x = 18

Solving
21 + x = 18

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

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

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

Simplifying
x = -3

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