$\frac{x^4+1x^2-4}{x^2+x+1}$
$3^9\:x\:3^5$
$0.7x-0.8y=1.6$
$\int\left(12t-8\right)dt$
$\left(\frac{y}{x^3}\right)\left(\frac{y}{x}\right)^{-1}$
$\int2x\left(x^2-2\right)^2dx$
$\frac{y^{15}-z^{15}}{y^3\:z^3}$
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