Solve for c
c=\frac{d}{3}
Solve for d
d=3c
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3c=d
The equation is in standard form.
\frac{3c}{3}=\frac{d}{3}
Divide both sides by 3.
c=\frac{d}{3}
Dividing by 3 undoes the multiplication by 3.
d=3c
Swap sides so that all variable terms are on the left hand side.
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