$-1-2-\left(3-5\cdot2\right)+4$
$x^2+7x+12\cdot x^2+5x+6$
$\lim_{x\to-7}\left(\frac{x^2+19x+84}{x+7}\right)$
$25y^2-25y+1$
$\frac{x}{x-1}=\frac{-1}{1-x}$
$\left(3+12x-4x^2\right)^2$
$\:-1-15$
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