$2\left(4+3x\right)-7x$
$\left(a-x\right)^2+\left(x-y\right)^2+\left(x^2-y^2\right).\left(m+x-n\right)$
$\lim_{x\to+\infty}\frac{4e^{-x^2}}{x^2-16}$
$72-32y^2$
$12,5+\:8,65$
$\sqrt[6]{n^5}-2+1$
$\frac{x-4}{x^2-3x-4};\:x=3.999;\:$
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