$4m^2-8mn-4m+8n$
$4+5\cdot10=\:$
$x^4+0+9x^2+4x+12$
$\frac{15}{5y^{-3}}$
$\lim_{x\to\infty}\left(\sqrt{\left(x^2+2x+2\right)-\left(x^2-2x+2\right)}\right)$
$-19+x>20$
$34ab+18ab+2ab$
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