$5d+3a+9d+5a$
$2v^3-3v^2$
$\frac{1+bx^2}{x-x^2}$
$\left(w+9\right)\left(w+6\right)$
$\frac{d}{dx}\frac{3x-2}{3x+2}=5y^2$
$\left(c+5\right).\left(c-9\right)$
$2x+x^2<3x^2+4$
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