$4x^2-441$
$-66-\left(-49\right)$
$f\left(x\right)=\:\left(3\sqrt{x}\right)\left(\frac{1}{\sqrt{2x+1}}\right)$
$2x\left(x-3\right)+1=0$
$\int\frac{3x^2+10x+24}{x+1\left(x^2+16\right)}dx$
$10m^2+8m+12+2m^2+9m-10$
$9\cdot3x$
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