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12*x^7-(((36*x^3)/4)*x^3) = 0
12*x^7-9*x^6 = 0
12*x^7-9*x^6 = 0
3*x^6*(4*x-3) = 0
4*x-3 = 0 // + 3
4*x = 3 // : 4
x = 3/4
3*x^6 = 0
3*x^6 = 0 // : 3
x^6 = 0
x = 0
x in { 3/4, 0 }
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