Philip P. answered 05/19/14
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(x-8/y11)-2
Recall that x-a = 1/xa, so 1/y11 = y-11
= (x-8*y-11)-2
(...)-2 means to multiply each exponent in the parentheses by -2:
= x(-8)(-2)*y(-11)(-2)
= x16*y22