$a^2-7a+9$
$2k\:+\:k\:+\:k\:-\:3k\:=\:\:\:$
$\int\left(-\frac{24}{x^2\sqrt{4-x^2}}\right)dx$
$x^2+4x^2+25$
$5x^2-45x+20=0$
$x^{2}-x-6=x-3$
$\int_2^x\left(\frac{1}{\ln\left(x\right)}\right)dx$
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