$\lim_{x\to-2}\left(\frac{2x^2+3x-2}{x+2}\right)$
$\left(\frac{13}{8}c^5d^{-1}\right)^2$
$9v^2-72vw+144w^2$
$6s+5s$
$m^2+16m$
$\frac{-24^3b^2c^4}{8ab^2c}$
$-18ab+16n-6ab+5-3n+2$
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