$\frac{2xy-1}{x}$
$+\left|30-40-5b\right|+7b$
$\left(-4y+5x\right)\left(2x+y\right)$
$\left(5a^2+3b^3\right)^2$
$\int_{-2\cdot\pi}^{-\pi}\left(1\cdot cos\left(nx\right)\right)dx$
$\sqrt{6-2}$
$4x-1>2x-9$
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