$\lim_{x\to1}\left(x^2-4\right)$
$m^7-mn$
$4y^2-8y+4$
$28-\left(-16-36\right)$
$x^2-13x+30=0$
$a\left(a+2b\right)+b^2$
$2 x - 11 = 3$
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