Solve for F
F=\pi Plr
l\neq 0\text{ and }r\neq 0
Solve for P
P=\frac{F}{\pi lr}
l\neq 0\text{ and }r\neq 0
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\frac{F}{\pi rl}=P
Swap sides so that all variable terms are on the left hand side.
\frac{1}{\pi lr}F=P
The equation is in standard form.
\frac{\frac{1}{\pi lr}F\pi lr}{1}=\frac{P\pi lr}{1}
Divide both sides by \pi ^{-1}r^{-1}l^{-1}.
F=\frac{P\pi lr}{1}
Dividing by \pi ^{-1}r^{-1}l^{-1} undoes the multiplication by \pi ^{-1}r^{-1}l^{-1}.
F=\pi Plr
Divide P by \pi ^{-1}r^{-1}l^{-1}.
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