$4h-2e^2+6,\:para\:h=-2\:y\:e=-1$
$x^2+9x+6x+54-x^2+3x+2x+6$
$-2x<10$
$\left(y-\frac{1}{4}\right)\left(y+\frac{3}{2}\right)$
$\lim_{x\to0}\left(a+\frac{1}{x}\right)$
$2x-7=-3x+18$
$3x+5\cdot3x+5$
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