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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+15 = 0
1/3*d+15 = 0
1/3*d+15 = 0 // - 15
1/3*d = -15 // : 1/3
d = -15/1/3
d = -45
d = -45
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