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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
60/(x-1) = 36/(x-1)+12 // - 36/(x-1)+12
60/(x-1)-(36/(x-1))-12 = 0
60/(x-1)-36*(x-1)^-1-12 = 0
60/(x-1)-36/(x-1)-12 = 0
60/(x-1)-36/(x-1)+(-12*(x-1))/(x-1) = 0
60-12*(x-1)-36 = 0
12-12*x+24 = 0
36-12*x = 0
(36-12*x)/(x-1) = 0
(36-12*x)/(x-1) = 0 // * x-1
36-12*x = 0
36-12*x = 0 // - 36
-12*x = -36 // : -12
x = -36/(-12)
x = 3
x = 3
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