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(x^4*((x^2*(((((3/5)*x^1)/2)*x^7)/4))/7))/5 = 0
(x^4*((x^2*(((((3/5)*x)/2)*x^7)/4))/7))/5 = 0
3/1400*x^14 = 0 // : 3/1400
x^14 = 0
x = 0
x = 0
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