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4*((4/7)*x^7+(7*x^1)/7) = 0
4*((4/7)*x^7+(7*x)/7) = 0
4*(4/7*x^7+x) = 0
4/7*x^7+x = 0
x*(4/7*x^6+1) = 0
4/7*x^6 = -1 // : 4/7
x^6 = -7/4
x = 0
4*x = 0
x = 0
x = 0
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