$x^2-7x=0$
$m^2-20mn+100n^2$
$-2\cdot\left(1\right)\cdot\left(-1\right)$
$\left(\sqrt{25}\right)^2$
$2f\:+\:6f\:+g\:+\:3g$
$g\left(x\right)=\left(\frac{\sin\left(x\right)}{1+\cos\left(x\right)}\right)^5$
$\left(a^2-ab+b^2+a+b+1\right)\left(a+b-1\right)$
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