Solve for b
b=15
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70+2b=100
Swap sides so that all variable terms are on the left hand side.
2b=100-70
Subtract 70 from both sides.
2b=30
Subtract 70 from 100 to get 30.
b=\frac{30}{2}
Divide both sides by 2.
b=15
Divide 30 by 2 to get 15.
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