$\:\left(-8\right)-\left(-16\right)$
$\left(15x+15\right)\left(15x-15\right)$
$\lim_{x\to1}\left(x\left(\frac{1}{1-x}\right)\right)$
$\left(3x^{m-2}\right)\left(-14x^{m+5}\right)$
$5a-8a+a-6a+21a$
$3x^2-24x+72y-264$
$2x-3y=-6$
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