Solve for v
v=-\frac{F}{4}
Solve for F
F=-4v
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-4v=F
Swap sides so that all variable terms are on the left hand side.
\frac{-4v}{-4}=\frac{F}{-4}
Divide both sides by -4.
v=\frac{F}{-4}
Dividing by -4 undoes the multiplication by -4.
v=-\frac{F}{4}
Divide F by -4.
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