Solve for b
b=-0.5
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-3b=4-2.5
Subtract 2.5 from both sides.
-3b=1.5
Subtract 2.5 from 4 to get 1.5.
b=\frac{1.5}{-3}
Divide both sides by -3.
b=\frac{15}{-30}
Expand \frac{1.5}{-3} by multiplying both numerator and the denominator by 10.
b=-\frac{1}{2}
Reduce the fraction \frac{15}{-30} to lowest terms by extracting and canceling out 15.
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