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D( x )
x+7 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x in (-oo:-7) U (-7:+oo)
x^2-(((6*x)/(x+7))*(x-6)) = 0
x^2-6*x*(x+7)^-1*(x-6) = 0
(-6*x*(x-6))/(x+7)+x^2 = 0
(-6*x*(x-6))/(x+7)+(x^2*(x+7))/(x+7) = 0
x^2*(x+7)-6*x*(x-6) = 0
x^3+x^2+36*x = 0
x^3+x^2+36*x = 0
x*(x^2+x+36) = 0
x^2+x+36 = 0
DELTA = 1^2-(1*4*36)
DELTA = -143
DELTA < 0
x = 0
x/(x+7) = 0
x/(x+7) = 0 // * x+7
x = 0
x = 0
x = 0
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