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D( x )
x = 0
x+1 = 0
x = 0
x = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:0) U (0:+oo)
1/(x+1)+1/x = 7/12 // - 7/12
1/(x+1)+1/x-(7/12) = 0
1/(x+1)+1/x-7/12 = 0
(1*12*x)/(12*x*(x+1))+(1*12*(x+1))/(12*x*(x+1))+(-7*x*(x+1))/(12*x*(x+1)) = 0
1*12*(x+1)-7*x*(x+1)+1*12*x = 0
24*x-7*x^2-7*x+12 = 0
17*x-7*x^2+12 = 0
17*x-7*x^2+12 = 0
17*x-7*x^2+12 = 0
DELTA = 17^2-(-7*4*12)
DELTA = 625
DELTA > 0
x = (625^(1/2)-17)/(-7*2) or x = (-625^(1/2)-17)/(-7*2)
x = -4/7 or x = 3
(x+4/7)*(x-3) = 0
((x+4/7)*(x-3))/(12*x*(x+1)) = 0
((x+4/7)*(x-3))/(12*x*(x+1)) = 0 // * 12*x*(x+1)
(x+4/7)*(x-3) = 0
( x+4/7 )
x+4/7 = 0 // - 4/7
x = -4/7
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -4/7, 3 }
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