$3^3\cdot3^2\cdot3^1\cdot3^0\cdot3^{-1}3^2$
$\left(x^28xy-5y^2\right)$
$5x^{2\:}-25x=0$
$3x^3+9x^2+6x$
$\left(2a^2\right)^8$
$x+3x+12x-5x=7x-56x-5x$
$3.14+-2.75+-5.29+1.35$
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