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D( x )
x+4 = 0
x-4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:-4) U (-4:4) U (4:+oo)
18/(x-4) = 20/(x+4)+1 // - 20/(x+4)+1
18/(x-4)-(20/(x+4))-1 = 0
18/(x-4)-20*(x+4)^-1-1 = 0
18/(x-4)-20/(x+4)-1 = 0
(18*(x+4))/((x-4)*(x+4))+(-20*(x-4))/((x-4)*(x+4))+(-1*(x-4)*(x+4))/((x-4)*(x+4)) = 0
18*(x+4)-20*(x-4)-1*(x-4)*(x+4) = 0
16-x^2-2*x+152 = 0
168-x^2-2*x = 0
168-x^2-2*x = 0
168-x^2-2*x = 0
DELTA = (-2)^2-(-1*4*168)
DELTA = 676
DELTA > 0
x = (676^(1/2)+2)/(-1*2) or x = (2-676^(1/2))/(-1*2)
x = -14 or x = 12
(x+14)*(x-12) = 0
((x+14)*(x-12))/((x-4)*(x+4)) = 0
((x+14)*(x-12))/((x-4)*(x+4)) = 0 // * (x-4)*(x+4)
(x+14)*(x-12) = 0
( x+14 )
x+14 = 0 // - 14
x = -14
( x-12 )
x-12 = 0 // + 12
x = 12
x in { -14, 12 }
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