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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
7/3-(3/(x-5)) = 19/12 // - 19/12
7/3-(3/(x-5))-(19/12) = 0
7/3-3*(x-5)^-1-19/12 = 0
7/3-3/(x-5)-19/12 = 0
(-3*3*12)/(3*12*(x-5))+(7*12*(x-5))/(3*12*(x-5))+(-19*3*(x-5))/(3*12*(x-5)) = 0
7*12*(x-5)-19*3*(x-5)-3*3*12 = 0
84*x-57*x-528+285 = 0
27*x-243 = 0
(27*x-243)/(3*12*(x-5)) = 0
(27*x-243)/(3*12*(x-5)) = 0 // * 3*12*(x-5)
27*x-243 = 0
27*x-243 = 0 // + 243
27*x = 243 // : 27
x = 243/27
x = 9
x = 9
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