$3.32pn\:-\:18pnr4$
$\left(7-5x\right)\left(49+35x+25x^2\right)$
$x^2\cdot\left(x^2-2x+1\right)$
$w=2ye^x-lnz$
$7x+2-6+3x+15-9x$
$\frac{5x^3-2x-8}{x+1}$
$\lim\:_{x\to\:\infty\:}\left(\frac{2^{x+1}}{2x}\right)$
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