Solve for a
a=-\frac{1}{3}\approx -0.333333333
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12a+3a=-5
Combine 36a and -24a to get 12a.
15a=-5
Combine 12a and 3a to get 15a.
a=\frac{-5}{15}
Divide both sides by 15.
a=-\frac{1}{3}
Reduce the fraction \frac{-5}{15} to lowest terms by extracting and canceling out 5.
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