Solve for b
b=7
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13=-8+3b
Subtract 13 from 5 to get -8.
-8+3b=13
Swap sides so that all variable terms are on the left hand side.
3b=13+8
Add 8 to both sides.
3b=21
Add 13 and 8 to get 21.
b=\frac{21}{3}
Divide both sides by 3.
b=7
Divide 21 by 3 to get 7.
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