Solve for x_6
x_{6}=\frac{y}{3}
Solve for y
y=3x_{6}
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3x_{6}=y
Swap sides so that all variable terms are on the left hand side.
\frac{3x_{6}}{3}=\frac{y}{3}
Divide both sides by 3.
x_{6}=\frac{y}{3}
Dividing by 3 undoes the multiplication by 3.
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