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2x=8+y
Add y to both sides.
2x=y+8
The equation is in standard form.
\frac{2x}{2}=\frac{y+8}{2}
Divide both sides by 2.
x=\frac{y+8}{2}
Dividing by 2 undoes the multiplication by 2.
x=\frac{y}{2}+4
Divide 8+y by 2.
-y=8-2x
Subtract 2x from both sides.
\frac{-y}{-1}=\frac{8-2x}{-1}
Divide both sides by -1.
y=\frac{8-2x}{-1}
Dividing by -1 undoes the multiplication by -1.
y=2x-8
Divide 8-2x by -1.