Solve for r
r=8
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3r-11=13
Swap sides so that all variable terms are on the left hand side.
3r=13+11
Add 11 to both sides.
3r=24
Add 13 and 11 to get 24.
r=\frac{24}{3}
Divide both sides by 3.
r=8
Divide 24 by 3 to get 8.
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