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x in (-oo:+oo)
9 = (x-2)/5 // - (x-2)/5
9-((x-2)/5) = 0
(-1*(x-2))/5+9 = 0
(-1*(x-2))/5+(5*9)/5 = 0
5*9-1*(x-2) = 0
47-x = 0
(47-x)/5 = 0
(47-x)/5 = 0 // * 5
47-x = 0
47-x = 0 // - 47
-x = -47 // * -1
x = 47
x = 47
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