$-2\:-\:\left(-\:8\:+\:6\right)$
$\int\left(-5\sec^2x\right)dx$
$x^2-16\:=0$
$4a-3b-5y+2a+4b-6a+4b$
$2^8.2^4$
$17-\left(-9\right)$
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