$3.24263+2.4142$
$x^2-81x=0$
$625x^4-125x^3+10x^2\cdot25^2$
$\frac{1}{1\:e^{-0.7}}$
$\lim_{x\to0}x$
$-3x+4y-2x-5x+6y$
$18\::\:\left(\:-\:1\:-\:2\right)$
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