Solve for a
a=-5
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7-3a=22
Swap sides so that all variable terms are on the left hand side.
-3a=22-7
Subtract 7 from both sides.
-3a=15
Subtract 7 from 22 to get 15.
a=\frac{15}{-3}
Divide both sides by -3.
a=-5
Divide 15 by -3 to get -5.
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