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x in (-oo:+oo)
x = d^2-((d^1)/(d^1)) // - d^2-((d^1)/(d^1))
x-d^2+(d^1)/(d^1) = 0
x-d^2+d/d = 0
x-d^2+1 = 0 // - 1-d^2
x = -(1-d^2)
x = d^2-1
x = d^2-1
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