$-3a+4b-6a+81b-11b+31a-b$
$-2\left(-1\right)^2-\left(-2\right)\left(-1\right)^3$
$\left(a-b\right)\left(a-c\right)$
$\int_0^t\left(e^{-2u}sin\left(3t-3u\right)\right)dx$
$7x-8+-3x-7$
$3-4x^2+x^2$
$279.2+3.036$
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