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x in (-oo:+oo)
(0/8)*x^7 = 0
0 = 0
0/8 = 0
0 = 0
0/8 = 0 // * 8
0 = 0
x^7 = 0
1*x^7 = 0 // : 1
x^7 = 0
x = 0
(0/8)*x^7 = 0 <=> 0/8 = 0 or (0/8)*x^7 = 0 <=> x^7 = 0
x in (-oo:+oo)
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