Solve for r
r=5
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10+12r=70
Swap sides so that all variable terms are on the left hand side.
12r=70-10
Subtract 10 from both sides.
12r=60
Subtract 10 from 70 to get 60.
r=\frac{60}{12}
Divide both sides by 12.
r=5
Divide 60 by 12 to get 5.
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