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x in (-oo:+oo)
(1/3)*(x-12) = 2/3 // - 2/3
(1/3)*(x-12)-(2/3) = 0
(1/3)*(x-12)-2/3 = 0
1/3*(x-12)-2/3 = 0
(1/3*3*(x-12))/3-2/3 = 0
1/3*3*(x-12)-2 = 0
x-14 = 0
(x-14)/3 = 0
(x-14)/3 = 0 // * 3
x-14 = 0
x-14 = 0 // + 14
x = 14
x = 14
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