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D( x )
x-18 = 0
x-18 = 0
x-18 = 0
x-18 = 0 // + 18
x = 18
x in (-oo:18) U (18:+oo)
y = (115*x)/(x-18) // - (115*x)/(x-18)
y-((115*x)/(x-18)) = 0
y-115*x*(x-18)^-1 = 0
(-115*x)/(x-18)+y = 0
(-115*x)/(x-18)+(y*(x-18))/(x-18) = 0
y*(x-18)-115*x = 0
x*y-115*x-18*y = 0
x*y-115*x-18*y = 0
x*y-18*y = 0 // + -18*y
x*y = -(-18*y) // : y
x = (-(-18*y))/y
x = 18
x-18 = 0
(x-18)/(x-18) = 0
(x-18)/(x-18) = 0 // * x-18
x-18 = 0
x-18 = 0 // + 18
x = 18
x in { 18}
x belongs to the empty set
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