$\left(2\:-7x\right)\:\left(1-3x\right)$
$\lim_{x\to a}\frac{\left(3x-x^2-\left(3a-a^2\right)\right)}{x-a}$
$\int\frac{2x+1}{\left(x^2+5x+6\right)}dx$
$450+345$
$3tanx+3=0$
$f\left(x\right)=\frac{x^2+x}{\left(1-x\right)^3}$
$-7x=112$
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