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45x=240-30y
Subtract 30y from both sides.
\frac{45x}{45}=\frac{240-30y}{45}
Divide both sides by 45.
x=\frac{240-30y}{45}
Dividing by 45 undoes the multiplication by 45.
x=\frac{16-2y}{3}
Divide 240-30y by 45.
30y=240-45x
Subtract 45x from both sides.
\frac{30y}{30}=\frac{240-45x}{30}
Divide both sides by 30.
y=\frac{240-45x}{30}
Dividing by 30 undoes the multiplication by 30.
y=-\frac{3x}{2}+8
Divide 240-45x by 30.