$\lim_{x\to0}\left(\frac{e^{-10x}-1}{5x}\right)$
$x^4+8x^3+2x^2-80x-75$
$7x-5<23$
$2a\cdot2a$
$\int\left(\frac{2x+7}{\left(3x^2+21x\right)^3}\right)dx$
$4x^2-18x-70=0$
$9+6b^6+b^{12}$
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