$\lim_{x\to\frac{9}{2}}\:\frac{\left(-20x\right)}{\left(9-2x\right)}$
$5+x=16$
$ab-ab+7ab+4ab-2ab$
$\lim_{x\to-1}\:\left(2x^2+6x-1\right)$
$\frac{x^3-2x^2+2x+1}{x-2}$
$4x+60x+100$
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