$2x-7<-x$
$xy'-2y=x^3e^x$
$x^2=x+90$
$\lim_{x\to0}\frac{\left(1+3x\right)^{-4}-1}{x}$
$\frac{a^{-4}b^8c^{-1}}{ab^{-2}c^6}$
$36x^2-12x+16y^2$
$\frac{\sin\left(x\right)^2}{\sin\left(x\right)}=\sin\left(x\right)$
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