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(1/4)*x^3-((3/20)*x^2) = 0
(1/4)*x^3+(-3/20)*x^2 = 0
1/4*x^3-3/20*x^2 = 0
1/4*x^2*(x-3/5) = 0
x-3/5 = 0 // + 3/5
x = 3/5
(x^2)/4 = 0
1/4*x^2 = 0 // : 1/4
x^2 = 0
x = 0
x in { 3/5, 0 }
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