Solve for d
d=\frac{37-a}{5}
Solve for a
a=37-5d
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5d=37-a
Subtract a from both sides.
\frac{5d}{5}=\frac{37-a}{5}
Divide both sides by 5.
d=\frac{37-a}{5}
Dividing by 5 undoes the multiplication by 5.
a=37-5d
Subtract 5d from both sides.
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