a-6=-21

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Solution for a-6=-21 equation: 


Simplifying
a + -6 = -21

Reorder the terms:
-6 + a = -21

Solving
-6 + a = -21

Solving for variable 'a'.

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

Add '6' to each side of the equation.
-6 + 6 + a = -21 + 6

Combine like terms: -6 + 6 = 0
0 + a = -21 + 6
a = -21 + 6

Combine like terms: -21 + 6 = -15
a = -15

Simplifying
a = -15

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