$3e+7-e\:2e+10+2e-3$
$1.24-3.16$
$\lim_{x\to0}\left(\frac{\sqrt{6+x}-\sqrt{6}}{x}\right)$
$\left(2x-7^3\right)$
$2\left(-1\right)^{12}\left(-1\right)-2+3\left(-2\right)-\left(+2\right)^2$
$x^3-27y^3$
$\left(-5\right)-\left(-16\right)$
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