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