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x in (-oo:+oo)
-4 = -4/X-x // + -4/X-x
x-(-4/X)-4 = 0
4*X^-1+x-4 = 0
4*X^-1+x-4 = 0 // - 4*X^-1-4
x = -(4*X^-1-4)
x = 4-(4*X^-1)
x = 4-(4*X^-1)
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