$3x^2+13x-30=0$
$^{x^{2019}+6=\left(e\right)^x}$
$842-12567$
$7\left(-2\right)\:-\:3$
$\int\left(2x+1\right)\sqrt{x^2-3x+4}dx$
$\:\left(x+3\right)\:\left(x+4\right)\:-\:\left(x+7\right)\left(x-2\right)\:\:+\:\left(x+9\right)\:\left(x-4\right)-\left(x+4\right)\left(x+1\right)$
$3\cdot39$
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