Solve for a
a = \frac{5}{3} = 1\frac{2}{3} \approx 1.666666667
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3a+7=12
Swap sides so that all variable terms are on the left hand side.
3a=12-7
Subtract 7 from both sides.
3a=5
Subtract 7 from 12 to get 5.
a=\frac{5}{3}
Divide both sides by 3.
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