$\frac{x}{4}-\frac{x+10}{2}=3$
$6-4+7+2+7-2-8+9-4-6$
$ax^6-6x^3-5;\:x=2$
$-3x^{x+1}+2x^{x+1}-x^{x+1}+2x^{x+1}$
$m2\:-\:m\:+\:0,25$
$\left(\frac{1}{x}+\frac{1}{y}\right)\left(\frac{1}{x}-\frac{1}{y}\right)$
$\lim_{x\to0}\left(\frac{e^2^x-1}{x}\right)$
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