Solve for x
Solve for y
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3x+4=y
Swap sides so that all variable terms are on the left hand side.
3x=y-4
Subtract 4 from both sides.
\frac{3x}{3}=\frac{y-4}{3}
Divide both sides by 3.
x=\frac{y-4}{3}
Dividing by 3 undoes the multiplication by 3.