$2-5.\left(7-8x\right)$
$\left(7m-3u\right)^2$
$1.999-2$
$18^{-1}\cdot18^3$
$\sqrt[6]{n^5}-2+1$
$\left(7a^{-2}b^3\right)x\left(6ab^2\right)$
$5\tan-4=7\tan0+11$
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