$\left(16p+20q\right).\left(16p-20q\right)$
$-10-10x$
$\frac{2a^2b^4a^3b}{\left(4ab\right)\left(3b^7\right)}$
$\left(x^{a+1}-3\right)\left(x^{a+1}+2\right)$
$17x^4-2x^3+3x^3-8x$
$2x^2+2x-4$
$3x-12xy+6y$
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