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x in (-oo:+oo)
(x/100)*x+x = 56 // - 56
(x/100)*x+x-56 = 0
1/100*x^2+x-56 = 0
DELTA = 1^2-(-56*1/100*4)
DELTA = 81/25
DELTA > 0
x = ((81/25)^(1/2)-1)/(1/100*2) or x = (-(81/25)^(1/2)-1)/(1/100*2)
x = 40 or x = -140
x in { -140, 40 }
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