Solve for x
x=\frac{y+3}{7}
Solve for y
y=7x-3
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7x-3=y
Swap sides so that all variable terms are on the left hand side.
7x=y+3
Add 3 to both sides.
\frac{7x}{7}=\frac{y+3}{7}
Divide both sides by 7.
x=\frac{y+3}{7}
Dividing by 7 undoes the multiplication by 7.
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