$16x^2-24x+9-25x^2-30x-9$
$4a=3b-121$
$\frac{x^2+1}{3-x}$
$\int\frac{2x-1}{\left(x-2\right)^2\left(x^2+9\right)}dx$
$10^{4}\times4^{5}$
$79^2-39^2$
$5x-6y^5-14y^5-13x$
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