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x in (-oo:+oo)
(x+2)/3 = 6 // - 6
(x+2)/3-6 = 0
(x+2)/3+(-6*3)/3 = 0
x-6*3+2 = 0
x-18+2 = 0
(x-18+2)/3 = 0
(x-18+2)/3 = 0 // * 3
x-18+2 = 0
x-18+2 = 0 // - 2-18
x = -(2-18)
x = 18-2
x = 18-2
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