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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+6/x = -7 // + 7
x+6/x+7 = 0
1*x^1+6*x^-1+7*x^0 = 0
(1*x^2+7*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2+7*x^1+6*x^0) = 0
x^1
x^2+7*x+6 = 0
x^2+7*x+6 = 0
DELTA = 7^2-(1*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)-7)/(1*2) or x = (-25^(1/2)-7)/(1*2)
x = -1 or x = -6
x in { -6, -1}
x in { -6, -1 }
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