$20y^2-18y^2$
$\left(x^4y^2z^6\right)\left(xy^5z^0\right)$
$2\left(17-1\right)+\left(-2\right)$
$\lim_{x\to3}\left(\frac{x+3}{\sqrt{x^2-5}-2}\right)$
$2\ln\left(x+1\right)+2\ln\left(x-5\right)=0$
$16m^6-56m^4+24m^2$
$1+4\sin^2x-5\sin x+\cos2x=0$
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