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(((8/25)/(4/15-(1/3)+3/5))*x^7)/18 = 0
(((8/25)/(4/15-1/3+3/5))*x^7)/18 = 0
1/30*x^7 = 0 // : 1/30
x^7 = 0
x = 0
x = 0
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