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D( x )
120*x-88 = 0
120*x-88 = 0
120*x-88 = 0
120*x-88 = 0 // + 88
120*x = 88 // : 120
x = 88/120
x = 11/15
x in (-oo:11/15) U (11/15:+oo)
-5/(120*x-88) = 11 // - 11
-5/(120*x-88)-11 = 0
(-11*(120*x-88))/(120*x-88)-5/(120*x-88) = 0
-11*(120*x-88)-5 = 0
963-1320*x = 0
(963-1320*x)/(120*x-88) = 0
(963-1320*x)/(120*x-88) = 0 // * 120*x-88
963-1320*x = 0
963-1320*x = 0 // - 963
-1320*x = -963 // : -1320
x = -963/(-1320)
x = 321/440
x = 321/440
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