$3-\:\:4\:-\:7\:-\:\left[-5-7\:+\:\left(6\:-\:7+\:5\:\right)\:\right]\:\:+8\:=\:$
$4x+2\le x+1$
$\sqrt{3^{4.\:2^6}}$
$3y'-5ty=t$
$\left|\left(\frac{4}{7}\right)^3\right|^5$
$4990+-57$
$3,26\cdot4,6$
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