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d in (-oo:+oo)
(2/3)*(d-12) = 4 // - 4
(2/3)*(d-12)-4 = 0
2/3*(d-12)-4 = 0
2/3*(d-12)-4 = 0
2/3*d-12 = 0
2/3*d-12 = 0
2/3*d-12 = 0 // + 12
2/3*d = 12 // : 2/3
d = 12/2/3
d = 18
d = 18
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