$\int\frac{6x-7}{x^2\left(x+2\right)}dx$
$a^2-9a+81$
$9x^2+18x=0$
$\frac{\left(+2h-2xh-h\right)}{h}$
$\left(-xy\right)-1$
$x^3+y^3=1$
$-\left(-\frac{1}{-\infty}\right)$
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