$x^2-9-22$
$\:9x^4y^3-18x^7y^6+\frac{21x^3y^2}{3x^3y^2}$
$\lim_{x\to0}\left(\frac{e^{tgx}-e^{-tgx}-2x}{2x^3}\right)$
$\frac{\left(a^3-37a-1\right)}{a-6}$
$3x^2-5x=68$
$\left(5a+25\right)^2$
$\left(-20\right)\cdot9:\left(-3\right)+4\cdot\left(-5\right)$
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