Solve for a
a = \frac{27}{4} = 6\frac{3}{4} = 6.75
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4+4a=31
Swap sides so that all variable terms are on the left hand side.
4a=31-4
Subtract 4 from both sides.
4a=27
Subtract 4 from 31 to get 27.
a=\frac{27}{4}
Divide both sides by 4.
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