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x in (-oo:+oo)
(0.9-(x/3))^3 = 0
(0.9-1/3*x)^3 = 0
0.9-1/3*x = 0 // - 0.9
-1/3*x = -0.9 // : -1/3
x = -0.9/(-1/3)
x = 2.70000003
x in { 2.70000003, 2.70000003, 2.70000003 }
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