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x in (-oo:+oo)
(x-4)/5 = 1 // - 1
(x-4)/5-1 = 0
(x-4)/5+(-1*5)/5 = 0
x-1*5-4 = 0
x-9 = 0
(x-9)/5 = 0
(x-9)/5 = 0 // * 5
x-9 = 0
x-9 = 0 // + 9
x = 9
x = 9
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