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(8-((8/7)*x))^3 = 0
((-8/7)*x+8)^3 = 0
(8-8/7*x)^3 = 0
8-8/7*x = 0 // - 8
-8/7*x = -8 // : -8/7
x = -8/(-8/7)
x = 7
x in { 7, 7, 7 }
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