$\lim_{x\to\infty}\left(2e^{-x}-x\right)$
$7-3\cdot1$
$\int_{1.293}^{2.707}\left[\left(2x^2-5x\right)-\left(3x-7\right)\right]dx$
$-13x^2+29x+6$
$25n^{12}-121m^4$
$4x+13^2$
$x^2-6x-280$
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