$5x^2-\:15x\:+\:3$
$2.\left(x+4\right)$
$1-5-\left(-6\right)$
$\lim_{x\to-1}\left(2x^2+3x+1\right)$
$-3834+5600$
$\frac{a+b}{a^2-ab}+\frac{a}{b^2-a^2}$
$5x+2y-3+2y+6+4x$
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