Solve for b
b=8
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7b-20-3b=12
Subtract 3b from both sides.
4b-20=12
Combine 7b and -3b to get 4b.
4b=12+20
Add 20 to both sides.
4b=32
Add 12 and 20 to get 32.
b=\frac{32}{4}
Divide both sides by 4.
b=8
Divide 32 by 4 to get 8.
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