$50\cdot46$
$6x^4-30x^3+2x$
$\frac{dy}{dx}=1-x-y$
$2+4x+4$
$\frac{x^{2}-0.09}{x-0.3}$
$\left(2m-n\right)^2$
$2b+5-5b+5$
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