$m-4m$
$+-0,4=0,6$
$\lim_{x\to999}\left(\frac{\sqrt{x}}{x+1}\right)$
$x-7=2x+1$
$\left(y^2\right)^7$
$\left(x-3\right)^5+\left(x-2\right)^4+\left(x^2-5x+1\right)^2+x-1$
$39\cdot39$
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