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8x+320=y
Swap sides so that all variable terms are on the left hand side.
8x=y-320
Subtract 320 from both sides.
\frac{8x}{8}=\frac{y-320}{8}
Divide both sides by 8.
x=\frac{y-320}{8}
Dividing by 8 undoes the multiplication by 8.
x=\frac{y}{8}-40
Divide y-320 by 8.