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D( x )
x+7 = 0
x-5 = 0
x+7 = 0
x+7 = 0
x+7 = 0 // - 7
x = -7
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:-7) U (-7:5) U (5:+oo)
6/(x-5) = -6/(x+7) // + -6/(x+7)
6/(x-5)-(-6/(x+7)) = 0
6/(x-5)+6*(x+7)^-1 = 0
6/(x-5)+6/(x+7) = 0
(6*(x+7))/((x-5)*(x+7))+(6*(x-5))/((x-5)*(x+7)) = 0
6*(x+7)+6*(x-5) = 0
12*x+12 = 0
(12*x+12)/((x-5)*(x+7)) = 0
(12*x+12)/((x-5)*(x+7)) = 0 // * (x-5)*(x+7)
12*x+12 = 0
12*x+12 = 0 // - 12
12*x = -12 // : 12
x = -12/12
x = -1
x = -1
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