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d in (-oo:+oo)
7*e-((7*d)/e)-d = 0
7*e-7*e^-1*d-d = 0
(-7*e^-1-1)*d+7*e = 0 // - 7*e
(-7*e^-1-1)*d = -(7*e) // : -7*e^-1-1
d = (-(7*e))/(-7*e^-1-1)
d = (-7*e)/(-7*e^-1-1)
d = (-7*e)/(-7*e^-1-1)
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