Solve for S
S=\frac{B}{21}
Solve for B
B=21S
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S\times 21=B
Swap sides so that all variable terms are on the left hand side.
21S=B
The equation is in standard form.
\frac{21S}{21}=\frac{B}{21}
Divide both sides by 21.
S=\frac{B}{21}
Dividing by 21 undoes the multiplication by 21.
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