$\left(7x^4+4x^2+7x+2\right)-\left(6x^3+8x+3\right)$
$2x^2-7x+6$
$\lim_{x\to\infty}\left(x^{\frac{2}{\left(2+\ln\left(x\right)\right)}}\right)$
$\lim_{x\to-1}\sqrt{51-2x}$
$\frac{dy}{dx}\left(6xy^3-x^2y=3\right)$
$2x+2y-3z=1$
$a2-7a-18$
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