$x-7<-9x+13$
$-1001-\left(-10001\right)$
$-2ax^3-2x^3+5ax^3$
$-11\cdot\left(1-4\right)$
$3.851+38$
$4^2\:+\:2\:.\:4\:.-3+-9$
$e^xseny-e^xcosx$
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