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D( x )
x+6 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:+oo)
(3*x+4)/(x+6) = 5/2 // - 5/2
(3*x+4)/(x+6)-(5/2) = 0
(3*x+4)/(x+6)-5/2 = 0
(2*(3*x+4))/(2*(x+6))+(-5*(x+6))/(2*(x+6)) = 0
2*(3*x+4)-5*(x+6) = 0
x-22 = 0
(x-22)/(2*(x+6)) = 0
(x-22)/(2*(x+6)) = 0 // * 2*(x+6)
x-22 = 0
x-22 = 0 // + 22
x = 22
x = 22
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