$\left(7^k-4^e\right)\left(4^e+7^k\right)$
$\int\frac{x^2}{\left(81-9x^{\left(2\right)}\right)^{\frac{3}{2}}}dx$
$-3h+9+4h-4$
$\left(x+2\right)\left(11x^3-3x^2+x+1\right)$
$\int\frac{x+8}{x^3-4x^2+4x}dx$
$8y^2-4y-20y+10$
$\left(m+3\right)x^2-\left(2m-1\right)x-5m+4=0$
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