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x in (-oo:+oo)
(x-4)/3 = 9 // - 9
(x-4)/3-9 = 0
(x-4)/3+(-9*3)/3 = 0
x-9*3-4 = 0
x-31 = 0
(x-31)/3 = 0
(x-31)/3 = 0 // * 3
x-31 = 0
x-31 = 0 // + 31
x = 31
x = 31
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