Solve for b
b=10
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100=\frac{20}{2}b
Multiply \frac{1}{2} and 20 to get \frac{20}{2}.
100=10b
Divide 20 by 2 to get 10.
10b=100
Swap sides so that all variable terms are on the left hand side.
b=\frac{100}{10}
Divide both sides by 10.
b=10
Divide 100 by 10 to get 10.
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