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Start with the given expression.

Rewrite

as

. Rewrite

as

. Rewrite

as

Multiply the outer exponent by EVERY exponent in the parenthesis

Multiply

Square -2 to get 4. Cube 2 to get 8

Reduce

to get

(these are the coefficients).

Subtract the exponents to divide the monomials.

Subtract

Flip the variable that has the negative exponent to make the exponent positive.
So

where

or