8)(8c-1)/(8c-1)=
9)(12mn2-18m3)/(3m)
10)(14a2bc-8b2a2c)/(2bc2)
11)(3x2y-4xy2+7x3y3)/(xy)
12)(x6-2x4y2-3x2y4)/(-3x3y3)
13)(3x-2)2-2y(3x-2)
(3x-2)
14)(a-b)5-(a-b)4
(a-b)5