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D( x )
18-(3*x) = 0
18-(3*x) = 0
18-(3*x) = 0
18-3*x = 0
18-3*x = 0 // - 18
-3*x = -18 // : -3
x = -18/(-3)
x = 6
x in (-oo:6) U (6:+oo)
65/(18-(3*x)) = 5 // - 5
65/(18-(3*x))-5 = 0
65/(18-3*x)-5 = 0
65/(18-3*x)+(-5*(18-3*x))/(18-3*x) = 0
65-5*(18-3*x) = 0
15*x-25 = 0
(15*x-25)/(18-3*x) = 0
(15*x-25)/(18-3*x) = 0 // * 18-3*x
15*x-25 = 0
15*x-25 = 0 // + 25
15*x = 25 // : 15
x = 25/15
x = 5/3
x = 5/3
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