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D( x )
x+1 = 0
x+6 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:-1) U (-1:+oo)
(x-7)/(x+6)+(x+8)/(x+1) = 0
((x-7)*(x+1))/((x+6)*(x+1))+((x+8)*(x+6))/((x+6)*(x+1)) = 0
(x-7)*(x+1)+(x+8)*(x+6) = 0
2*x^2+8*x+41 = 0
2*x^2+8*x+41 = 0
2*x^2+8*x+41 = 0
DELTA = 8^2-(2*4*41)
DELTA = -264
DELTA < 0
1 = 0
1/((x+6)*(x+1)) = 0
1/((x+6)*(x+1)) = 0 // * (x+6)*(x+1)
1 = 0
x belongs to the empty set
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