$6+9x-1$
$\left(+1300\right)-\left(-780\right)$
$2^{x-4}-7=25$
$\left(3xy^{-4}\right)^{-2}$
$\lim_{x\to0}\left(\frac{sinx}{\sqrt{1-x}-1}\right)$
$( x - 2 y ) ^ { 6 }$
$21\cdot87$
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