Solve for m
m=\frac{d-n}{7}
Solve for d
d=7m+n
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7m=d-n
Subtract n from both sides.
\frac{7m}{7}=\frac{d-n}{7}
Divide both sides by 7.
m=\frac{d-n}{7}
Dividing by 7 undoes the multiplication by 7.
d=n+7m
Swap sides so that all variable terms are on the left hand side.
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