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4x=2y
Swap sides so that all variable terms are on the left hand side.
\frac{4x}{4}=\frac{2y}{4}
Divide both sides by 4.
x=\frac{2y}{4}
Dividing by 4 undoes the multiplication by 4.
x=\frac{y}{2}
Divide 2y by 4.
2y=4x
The equation is in standard form.
\frac{2y}{2}=\frac{4x}{2}
Divide both sides by 2.
y=\frac{4x}{2}
Dividing by 2 undoes the multiplication by 2.
y=2x
Divide 4x by 2.