$4x^2+100x+25$
$\left(5k-10\right).-9$
$\frac{\left(24x-2\right)}{2}$
$-0.45\cdot91$
$\sqrt{5}\cdot2\sqrt{6}$
$x+3y+2z=2$
$\lim_{x\:\:\to0}\left(\frac{6+6x-6e^x}{1-cosx\:}\right)$
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