Solve for B
B=\frac{A}{30}
Solve for A
A=30B
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30B=A
Swap sides so that all variable terms are on the left hand side.
\frac{30B}{30}=\frac{A}{30}
Divide both sides by 30.
B=\frac{A}{30}
Dividing by 30 undoes the multiplication by 30.
Examples
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