Solve for m
m=\frac{d-9n}{4}
Solve for d
d=4m+9n
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4m+9n=d
Swap sides so that all variable terms are on the left hand side.
4m=d-9n
Subtract 9n from both sides.
\frac{4m}{4}=\frac{d-9n}{4}
Divide both sides by 4.
m=\frac{d-9n}{4}
Dividing by 4 undoes the multiplication by 4.
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