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x in (-oo:+oo)
100*2000-((5*x*x)/100) = 0
(-1/20)*x^2+100*2000 = 0
-1/20*x^2 = -200000 // : -1/20
x^2 = 4000000
x^2 = 4000000 // ^ 1/2
abs(x) = 2000
x = 2000 or x = -2000
x in { 2000, -2000 }
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