Solve for b
b=20
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0.6b=12
Combine 1.3b and -0.7b to get 0.6b.
b=\frac{12}{0.6}
Divide both sides by 0.6.
b=\frac{120}{6}
Expand \frac{12}{0.6} by multiplying both numerator and the denominator by 10.
b=20
Divide 120 by 6 to get 20.
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