$\lim_{x\to0}\left(\frac{\left(e^x-x\right)}{x^2-x}\right)$
$8n^3+27$
$\int e^{-5x}cos\left(-3x\right)dx$
$6\left(x-8\right)=72$
$\left(20-b\right)^2$
$4x^2\cdot5x^3$
$2x<-6$
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