Solve for d
d=\frac{m}{2}
Solve for m
m=2d
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2d=m
Swap sides so that all variable terms are on the left hand side.
\frac{2d}{2}=\frac{m}{2}
Divide both sides by 2.
d=\frac{m}{2}
Dividing by 2 undoes the multiplication by 2.
Examples
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Matrix
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Limits
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