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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(2*x-3)/(x-4) = 7/5 // - 7/5
(2*x-3)/(x-4)-(7/5) = 0
(2*x-3)/(x-4)-7/5 = 0
(5*(2*x-3))/(5*(x-4))+(-7*(x-4))/(5*(x-4)) = 0
5*(2*x-3)-7*(x-4) = 0
3*x+13 = 0
(3*x+13)/(5*(x-4)) = 0
(3*x+13)/(5*(x-4)) = 0 // * 5*(x-4)
3*x+13 = 0
3*x+13 = 0 // - 13
3*x = -13 // : 3
x = -13/3
x = -13/3
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