$\lim_{x\to4}\left(\frac{x^2-3x-28}{x-4}\right)$
$x-5>2x-6$
$\int\left(\frac{1}{2}x^2\right)dx$
$-4\left(3x-5\right)+9x+4$
$\left(9p^3+7x\right)\left(9p^3-7x\right)$
$12x^2-6x^4y+15x^3y$
$\left(5a-3b+c\right)-\left(-3c+8b\right)$
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