-3a-6=21

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Solution for -3a-6=21 equation: 


Simplifying
-3a + -6 = 21

Reorder the terms:
-6 + -3a = 21

Solving
-6 + -3a = 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 + -3a = 21 + 6

Combine like terms: -6 + 6 = 0
0 + -3a = 21 + 6
-3a = 21 + 6

Combine like terms: 21 + 6 = 27
-3a = 27

Divide each side by '-3'.
a = -9

Simplifying
a = -9

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