$85\:-\:\left(-90\right)\:+\:\left(-155\right)\:-\:\left(-8\right)\:+\:50\:-\:20$
$\sqrt{9-x}=2$
$\int x^8\left(x^9+3\right)^7\:dx$
$3log2+log3=log\left(5x-1\right)$
$7-3mk+4km+4$
$-28\:.\:-14$
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