$\left(-40\right):5:2$
$-2x^2-6x+36$
$y-xy$
$3x^2-5x+7x^2+2x$
$5.7\:x\:102\:,\:1.2\:x\:104,\:6.8x\:109\:,\:3.4\:x\:10-7$
$\lim_{x\to-\infty}\left(3^{x-2}\right)$
$5\cdot\left(-4+2-3\right)$
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