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40*x^3-(((3*x)/8)*x) = 0
40*x^3+(-3/8)*x^2 = 0
40*x^3-3/8*x^2 = 0
x^2*(40*x-3/8) = 0
40*x-3/8 = 0 // + 3/8
40*x = 3/8 // : 40
x = 3/8/40
x = 3/320
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 3/320, 0 }
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