Solve for d
d=-\frac{n}{2}+4
Solve for n
n=8-2d
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40=10d+5n
Multiply 1 and 40 to get 40.
10d+5n=40
Swap sides so that all variable terms are on the left hand side.
10d=40-5n
Subtract 5n from both sides.
\frac{10d}{10}=\frac{40-5n}{10}
Divide both sides by 10.
d=\frac{40-5n}{10}
Dividing by 10 undoes the multiplication by 10.
d=-\frac{n}{2}+4
Divide 40-5n by 10.
40=10d+5n
Multiply 1 and 40 to get 40.
10d+5n=40
Swap sides so that all variable terms are on the left hand side.
5n=40-10d
Subtract 10d from both sides.
\frac{5n}{5}=\frac{40-10d}{5}
Divide both sides by 5.
n=\frac{40-10d}{5}
Dividing by 5 undoes the multiplication by 5.
n=8-2d
Divide 40-10d by 5.
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