$-7x^2+5x-6+8x-9+4x^2$
$\frac{1}{2x-x^2};a=1$
$-9ab+8ab-ab$
$\frac{6x^2+35x+50}{2x+7}$
$\frac{1}{\infty^2}$
$\int\frac{x}{\sqrt{-105-7x^2-56x}}dx$
$5\cdot\frac{\left(-2^8\right)}{2^4}$
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