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2x=8-7y
Subtract 7y from both sides.
\frac{2x}{2}=\frac{8-7y}{2}
Divide both sides by 2.
x=\frac{8-7y}{2}
Dividing by 2 undoes the multiplication by 2.
x=-\frac{7y}{2}+4
Divide 8-7y by 2.
7y=8-2x
Subtract 2x from both sides.
\frac{7y}{7}=\frac{8-2x}{7}
Divide both sides by 7.
y=\frac{8-2x}{7}
Dividing by 7 undoes the multiplication by 7.