Solve for b
b=20
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4b-100+b=0
Add b to both sides.
5b-100=0
Combine 4b and b to get 5b.
5b=100
Add 100 to both sides. Anything plus zero gives itself.
b=\frac{100}{5}
Divide both sides by 5.
b=20
Divide 100 by 5 to get 20.
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