$2x^2+7x-3=0$
$-9n+12n+7$
$log\left(x^2-9x\right)=1$
$\int7x^7dx$
$\left(2k+3\right)^2$
$\left(x^3\right)^{50}$
$-9a^2b^3c+3abc^3-6a^3b^3c\:$
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