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d in (-oo:+oo)
3*(d+12) = (3/5)*(5+10) // - (3/5)*(5+10)
3*(d+12)-((3/5)*(5+10)) = 0
3*(d+12)+(-3/5)*(5+10) = 0
3*(d+12)-9 = 0
3*(d+12)-9 = 0
3*d+27 = 0
3*d+27 = 0
3*d+27 = 0 // - 27
3*d = -27 // : 3
d = -27/3
d = -9
d = -9
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