$3a+2b+a-3b$
$\left(m^2+mn+n^2\right)\left(m^2+n\right)$
$9x^2+126+49$
$\left(c+5\right)\left(c-5\right)$
$5\ln\left(x\right)-3\ln\left(x-3\right)+\ln\left(4x\right)$
$20+90+513$
$-\frac{60}{-10}$
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