$\left(a\:-\:b\right)\:-\:\left(b\:-\:a\right)^2$
$-\left(6-2\right)-\left(7-9\right)$
$\frac{-5^8}{-5^4}$
$3b+5u+6u+2b$
$e^{y-lny}$
$2x\:+5y-x-3y$
$\left(-16\right)-\left(-17\right)$
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