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x in (-oo:+oo)
8*x = (1/2)*x^2 // - (1/2)*x^2
8*x-((1/2)*x^2) = 0
(-1/2)*x^2+8*x = 0
8*x-1/2*x^2 = 0
DELTA = 8^2-(-1/2*0*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)-8)/(-1/2*2) or x = (-64^(1/2)-8)/(-1/2*2)
x = 0 or x = 16
x in { 0, 16 }
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