Solve for a
a = -\frac{23}{6} = -3\frac{5}{6} \approx -3.833333333
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12+3a=0.5
Swap sides so that all variable terms are on the left hand side.
3a=0.5-12
Subtract 12 from both sides.
3a=-11.5
Subtract 12 from 0.5 to get -11.5.
a=\frac{-11.5}{3}
Divide both sides by 3.
a=\frac{-115}{30}
Expand \frac{-11.5}{3} by multiplying both numerator and the denominator by 10.
a=-\frac{23}{6}
Reduce the fraction \frac{-115}{30} to lowest terms by extracting and canceling out 5.
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