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x in (-oo:+oo)
4*x^6-((5*x^7)/1) = 0
4*x^6-5*x^7 = 0
4*x^6-5*x^7 = 0
x^6*(4-5*x) = 0
4-5*x = 0 // - 4
-5*x = -4 // : -5
x = -4/(-5)
x = 4/5
x^6 = 0
1*x^6 = 0 // : 1
x^6 = 0
x = 0
x in { 4/5, 0 }
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