$-\left(m+6n\right)=-2m+n$
$5x-2<-7x$
$x^2-30x+225=441$
$xy-y=2x^2y$
$\int\left(\frac{\left(4-\sqrt{x}\right)^2}{\sqrt{x}}\right)dx$
$\frac{x^3-1}{x-5}$
$\int_{-2}^2\left(e^{-x}\right)dx$
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