a-18=-21

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Solution for a-18=-21 equation: 


Simplifying
a + -18 = -21

Reorder the terms:
-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 = -3
a = -3

Simplifying
a = -3

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