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y=1-4x
Subtract 7 from 8 to get 1.
1-4x=y
Swap sides so that all variable terms are on the left hand side.
-4x=y-1
Subtract 1 from both sides.
\frac{-4x}{-4}=\frac{y-1}{-4}
Divide both sides by -4.
x=\frac{y-1}{-4}
Dividing by -4 undoes the multiplication by -4.
x=\frac{1-y}{4}
Divide y-1 by -4.
y=1-4x
Subtract 7 from 8 to get 1.