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p-q=pq^{2}q
Multiply q and q to get q^{2}.
p-q=pq^{3}
To multiply powers of the same base, add their exponents. Add 2 and 1 to get 3.
p-q-pq^{3}=0
Subtract pq^{3} from both sides.
p-pq^{3}=q
Add q to both sides. Anything plus zero gives itself.
\left(1-q^{3}\right)p=q
Combine all terms containing p.
\frac{\left(1-q^{3}\right)p}{1-q^{3}}=\frac{q}{1-q^{3}}
Divide both sides by 1-q^{3}.
p=\frac{q}{1-q^{3}}
Dividing by 1-q^{3} undoes the multiplication by 1-q^{3}.
p=\frac{q}{\left(1-q\right)\left(q^{2}+q+1\right)}
Divide q by 1-q^{3}.