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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)
10/15 = 4/(x-5) // - 4/(x-5)
10/15-(4/(x-5)) = 0
10/15-4*(x-5)^-1 = 0
2/3-4/(x-5) = 0
(-4*3)/(3*(x-5))+(2*(x-5))/(3*(x-5)) = 0
2*(x-5)-4*3 = 0
2*x-22 = 0
(2*x-22)/(3*(x-5)) = 0
(2*x-22)/(3*(x-5)) = 0 // * 3*(x-5)
2*x-22 = 0
2*x-22 = 0 // + 22
2*x = 22 // : 2
x = 22/2
x = 11
x = 11
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