-4a=9-21

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Solution for -4a=9-21 equation: 


Simplifying
-4a = 9 + -21

Combine like terms: 9 + -21 = -12
-4a = -12

Solving
-4a = -12

Solving for variable 'a'.

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

Divide each side by '-4'.
a = 3

Simplifying
a = 3

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