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12-4a=8
Subtract 1 from 13 to get 12.
-4a=8-12
Subtract 12 from both sides.
-4a=-4
Subtract 12 from 8 to get -4.
a=\frac{-4}{-4}
Divide both sides by -4.
a=1
Divide -4 by -4 to get 1.