$x-4,1\ge0$
$\int_0^{\infty}50xe^{-5x}dx$
$16a^2-20ab+4b^2$
$\left(4x-2y+3\right)dx+\left(5y-2x+7\right)dy$
$y''+225y=0$
$4x-6\le2x+4$
$\frac{10}{\sqrt{x}-\sqrt{3}}$
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