\[p=abc\]

Solving for a. Want to solve for b or solve for c instead?
1
Divide both sides by bb.
pb=ac\frac{p}{b}=ac

2
Divide both sides by cc.
pbc=a\frac{\frac{p}{b}}{c}=a

3
Simplify  pbc\frac{\frac{p}{b}}{c}  to  pbc\frac{p}{bc}.
pbc=a\frac{p}{bc}=a

4
Switch sides.
a=pbca=\frac{p}{bc}

Done

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