$c=100-x-x^2$
$8x\:+\:17y\:+\:9x$
$\left(3xy^3\right)\left(-2xy^2\right)$
$10^{log4}$
$x-5-x^2-5-x-5$
$5+20k+20k^2$
$\int3x^2\:\left(x^3+1\right)^8dx$
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