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16*x^7-(((8*x^3)/2)*x^3) = 0
16*x^7-4*x^6 = 0
16*x^7-4*x^6 = 0
4*x^6*(4*x-1) = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
4*x^6 = 0
4*x^6 = 0 // : 4
x^6 = 0
x = 0
x in { 1/4, 0 }
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