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5x=40-8y
Subtract 8y from both sides.
\frac{5x}{5}=\frac{40-8y}{5}
Divide both sides by 5.
x=\frac{40-8y}{5}
Dividing by 5 undoes the multiplication by 5.
x=-\frac{8y}{5}+8
Divide 40-8y by 5.
8y=40-5x
Subtract 5x from both sides.
\frac{8y}{8}=\frac{40-5x}{8}
Divide both sides by 8.
y=\frac{40-5x}{8}
Dividing by 8 undoes the multiplication by 8.
y=-\frac{5x}{8}+5
Divide 40-5x by 8.