Solve for x_4
x_{4}=2y
Solve for y
y=\frac{x_{4}}{2}
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\frac{1}{2}x_{4}=y
Swap sides so that all variable terms are on the left hand side.
\frac{\frac{1}{2}x_{4}}{\frac{1}{2}}=\frac{y}{\frac{1}{2}}
Multiply both sides by 2.
x_{4}=\frac{y}{\frac{1}{2}}
Dividing by \frac{1}{2} undoes the multiplication by \frac{1}{2}.
x_{4}=2y
Divide y by \frac{1}{2} by multiplying y by the reciprocal of \frac{1}{2}.
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