a-39=-21

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Solution for a-39=-21 equation: 


Simplifying
a + -39 = -21

Reorder the terms:
-39 + a = -21

Solving
-39 + a = -21

Solving for variable 'a'.

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

Add '39' to each side of the equation.
-39 + 39 + a = -21 + 39

Combine like terms: -39 + 39 = 0
0 + a = -21 + 39
a = -21 + 39

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

Simplifying
a = 18

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