-18+a=21

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Solution for -18+a=21 equation: 


Simplifying
-18 + a = 21

Solving
-18 + a = 21

Solving for variable 'a'.

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

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

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

Combine like terms: 21 + 18 = 39
a = 39

Simplifying
a = 39

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