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(4/5)*x^3-((3/2)*x^2) = 0
(4/5)*x^3+(-3/2)*x^2 = 0
4/5*x^3-3/2*x^2 = 0
x^2*(4/5*x-3/2) = 0
4/5*x-3/2 = 0 // + 3/2
4/5*x = 3/2 // : 4/5
x = 3/2/4/5
x = 15/8
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 15/8, 0 }
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