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x in (-oo:+oo)
(x-6)/3 = 6 // - 6
(x-6)/3-6 = 0
(x-6)/3+(-6*3)/3 = 0
x-6*3-6 = 0
x-24 = 0
(x-24)/3 = 0
(x-24)/3 = 0 // * 3
x-24 = 0
x-24 = 0 // + 24
x = 24
x = 24
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