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D( x )
5*x-45 = 0
2*x-18 = 0
5*x-45 = 0
5*x-45 = 0
5*x-45 = 0 // + 45
5*x = 45 // : 5
x = 45/5
x = 9
2*x-18 = 0
2*x-18 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x in (-oo:9) U (9:+oo)
8/(5*x-45)-(3/(2*x-18)) = 0
8/(5*x-45)-3*(2*x-18)^-1 = 0
8/(5*x-45)-3/(2*x-18) = 0
(8*(2*x-18))/((5*x-45)*(2*x-18))+(-3*(5*x-45))/((5*x-45)*(2*x-18)) = 0
8*(2*x-18)-3*(5*x-45) = 0
x-9 = 0
(x-9)/((5*x-45)*(2*x-18)) = 0
(x-9)/((5*x-45)*(2*x-18)) = 0 // * (5*x-45)*(2*x-18)
x-9 = 0
x-9 = 0 // + 9
x = 9
x in { 9}
x belongs to the empty set
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