Solve for a
a=10
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20+3a=50
Swap sides so that all variable terms are on the left hand side.
3a=50-20
Subtract 20 from both sides.
3a=30
Subtract 20 from 50 to get 30.
a=\frac{30}{3}
Divide both sides by 3.
a=10
Divide 30 by 3 to get 10.
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