$\lim_{x\to2}\left(\frac{2x^2-4x}{x-2}\right)$
$-5a+b\:\:-7a+5$
$4\left(x+5\right)-2x+34$
$7x-8+10x-3x+4$
$\left(6xy+2y^2-5\right)dx+\left(3x^2+4xy-6\right)dy$
$x^2y-y-zy$
$a^2-30a+224$
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