$x-7<-9x+13$
$\frac{\left(x^3-19x+30\right)}{\left(x-2\right)}$
$6x^2=21x+90$
$f\left(x\right)=2\left(-5\right)^2-6\left(-5\right)+5$
$\frac{x^3+x^2+x-2}{x-1}$
$\int\sqrt{1211-t^2}dt$
$\int\left(\frac{2e^{2x}}{4+e^{2x}}\right)dx$
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