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((((x^1)/8)*y^-1)/9)*((((x^7)/4)*y^1)/2) = 0
(((x/8)*y^-1)/9)*((((x^7)/4)*y)/2) = 0
1/576*x^8 = 0 // : 1/576
x^8 = 0
x = 0
x = 0
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