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x in (-oo:+oo)
(x+3)/3 = 4 // - 4
(x+3)/3-4 = 0
(x+3)/3+(-4*3)/3 = 0
x-4*3+3 = 0
x-9 = 0
(x-9)/3 = 0
(x-9)/3 = 0 // * 3
x-9 = 0
x-9 = 0 // + 9
x = 9
x = 9
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