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-(x^10*((6*x^13)/(-2)))-20*x^16 = 0
3*x^23-20*x^16 = 0
3*x^23-20*x^16 = 0
x^16*(3*x^7-20) = 0
3*x^7 = 20 // : 3
x^7 = 20/3
x^7 = 20/3 // ^ 1/7
x = (20/3)^(1/7)
x^16 = 0
1*x^16 = 0 // : 1
x^16 = 0
x = 0
x in { (20/3)^(1/7), 0 }
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