a-8=-21

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Solution for a-8=-21 equation: 


Simplifying
a + -8 = -21

Reorder the terms:
-8 + a = -21

Solving
-8 + a = -21

Solving for variable 'a'.

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

Add '8' to each side of the equation.
-8 + 8 + a = -21 + 8

Combine like terms: -8 + 8 = 0
0 + a = -21 + 8
a = -21 + 8

Combine like terms: -21 + 8 = -13
a = -13

Simplifying
a = -13

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