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d in (-oo:+oo)
(-2/3)*(d-3) = 30 // - 30
(-2/3)*(d-3)-30 = 0
-2/3*(d-3)-30 = 0
-2/3*(d-3)-30 = 0
-2/3*d-28 = 0
-2/3*d-28 = 0
-2/3*d-28 = 0 // + 28
-2/3*d = 28 // : -2/3
d = 28/(-2/3)
d = -42
d = -42
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