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d in (-oo:+oo)
(1/3)*(d-9) = -12 // + 12
(1/3)*(d-9)+12 = 0
1/3*(d-9)+12 = 0
1/3*(d-9)+12 = 0
1/3*d+9 = 0
1/3*d+9 = 0
1/3*d+9 = 0 // - 9
1/3*d = -9 // : 1/3
d = -9/1/3
d = -27
d = -27
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