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X in (-oo:+oo)
(2/3)*(2*X-1) = 12 // - 12
(2/3)*(2*X-1)-12 = 0
2/3*(2*X-1)-12 = 0
2/3*(2*X-1)-12 = 0
4/3*X-38/3 = 0
4/3*X-38/3 = 0
4/3*X-38/3 = 0 // + 38/3
4/3*X = 38/3 // : 4/3
X = 38/3/4/3
X = 19/2
X = 19/2
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