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72x=90-3y
Subtract 3y from both sides.
\frac{72x}{72}=\frac{90-3y}{72}
Divide both sides by 72.
x=\frac{90-3y}{72}
Dividing by 72 undoes the multiplication by 72.
x=-\frac{y}{24}+\frac{5}{4}
Divide 90-3y by 72.
3y=90-72x
Subtract 72x from both sides.
\frac{3y}{3}=\frac{90-72x}{3}
Divide both sides by 3.
y=\frac{90-72x}{3}
Dividing by 3 undoes the multiplication by 3.
y=30-24x
Divide 90-72x by 3.