Solve for b
b=-20
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0.2b+7-0.5b=13
Subtract 0.5b from both sides.
-0.3b+7=13
Combine 0.2b and -0.5b to get -0.3b.
-0.3b=13-7
Subtract 7 from both sides.
-0.3b=6
Subtract 7 from 13 to get 6.
b=\frac{6}{-0.3}
Divide both sides by -0.3.
b=\frac{60}{-3}
Expand \frac{6}{-0.3} by multiplying both numerator and the denominator by 10.
b=-20
Divide 60 by -3 to get -20.
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