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d in (-oo:+oo)
(2/5)*(d-3) = 30 // - 30
(2/5)*(d-3)-30 = 0
2/5*(d-3)-30 = 0
2/5*(d-3)-30 = 0
2/5*d-156/5 = 0
2/5*d-156/5 = 0
2/5*d-156/5 = 0 // + 156/5
2/5*d = 156/5 // : 2/5
d = 156/5/2/5
d = 78
d = 78
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