Solve for b
b = -\frac{7}{2} = -3\frac{1}{2} = -3.5
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0=\frac{7}{2}+b
Multiply \frac{7}{2} and 1 to get \frac{7}{2}.
\frac{7}{2}+b=0
Swap sides so that all variable terms are on the left hand side.
b=-\frac{7}{2}
Subtract \frac{7}{2} from both sides. Anything subtracted from zero gives its negation.
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