$\frac{x-1}{x+1\cdot x-1}$
$0.2819740503-\left(\frac{-0.99999682249\left(1.3-0.2819740503\right)}{12.78584918-12.78584918}\right)$
$-19=x-19$
$3e^{2x}+5=16e^x$
$x^3+x-2\cdot x^2-2x+1$
$\left(160\cdot243\right)\:\frac{1}{5}$
$x^2+x-8$
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