Solve for x
x=-\frac{F}{3}+1
Solve for F
F=3-3x
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-3x=F-3
Swap sides so that all variable terms are on the left hand side.
\frac{-3x}{-3}=\frac{F-3}{-3}
Divide both sides by -3.
x=\frac{F-3}{-3}
Dividing by -3 undoes the multiplication by -3.
x=-\frac{F}{3}+1
Divide F-3 by -3.
F=-3x+3
Add 3 to both sides.
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