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D( X )
X-60 = 0
X-60 = 0
X-60 = 0
X-60 = 0 // + 60
X = 60
X in (-oo:60) U (60:+oo)
1.2 = X/(X-60) // - X/(X-60)
1.2-(X/(X-60)) = 0
(-1*X)/(X-60)+1.2 = 0
(-1*X)/(X-60)+(1.2*(X-60))/(X-60) = 0
1.2*(X-60)-1*X = 0
0.2*X-72 = 0
(0.2*X-72)/(X-60) = 0
(0.2*X-72)/(X-60) = 0 // * X-60
0.2*X-72 = 0
0.2*X-72 = 0 // + 72
0.2*X = 72 // : 0.2
X = 72/0.2
X = 360
X = 360
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