Question 474760
{{{(-3b^-2c^-6)(-b^9c^-1) }}}

{{{-3(1/b^2)*(1/c^6)*(-b^9(1/c)) }}}



{{{(-3)*(-b^cross(9)^7)/(cross(b^2)*c^7) }}}


{{{(3b^7)/c^7 }}}