Solve for b
b=3v
Solve for v
v=\frac{b}{3}
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\frac{1}{3}b=v
Swap sides so that all variable terms are on the left hand side.
\frac{\frac{1}{3}b}{\frac{1}{3}}=\frac{v}{\frac{1}{3}}
Multiply both sides by 3.
b=\frac{v}{\frac{1}{3}}
Dividing by \frac{1}{3} undoes the multiplication by \frac{1}{3}.
b=3v
Divide v by \frac{1}{3} by multiplying v by the reciprocal of \frac{1}{3}.
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