a-21=-12

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Solution for a-21=-12 equation: 


Simplifying
a + -21 = -12

Reorder the terms:
-21 + a = -12

Solving
-21 + a = -12

Solving for variable 'a'.

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

Add '21' to each side of the equation.
-21 + 21 + a = -12 + 21

Combine like terms: -21 + 21 = 0
0 + a = -12 + 21
a = -12 + 21

Combine like terms: -12 + 21 = 9
a = 9

Simplifying
a = 9

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