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x in (-oo:+oo)
-7*x^2 = ((-x)^1)/2 // - ((-x)^1)/2
-7*x^2-(((-x)^1)/2) = 0
(1/2)*x-7*x^2 = 0
1/2*x-7*x^2 = 0
DELTA = (1/2)^2-(-7*0*4)
DELTA = 1/4
DELTA > 0
x = ((1/4)^(1/2)-1/2)/(-7*2) or x = (-(1/4)^(1/2)-1/2)/(-7*2)
x = 0 or x = 1/14
x in { 0, 1/14 }
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