$\:2q\:+\:1-2$
$\left(\frac{2}{3}-\frac{1}{7}\right)^2$
$\left(x-6\right)\left(x-9\right)$
$s^2-6s+9=0$
$\int_0^{2\pi}e^{-x}sin\left(x\right)dx$
$0.4\sqrt{2}$
$-4u+21u^2-21u^2+1$
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