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d in (-oo:+oo)
51/20 = d+(1/2)*d+3 // - d+(1/2)*d+3
51/20-d-((1/2)*d)-3 = 0
(-1/2)*d-d+51/20-3 = 0
-3/2*d-9/20 = 0 // + 9/20
-3/2*d = 9/20 // : -3/2
d = 9/20/(-3/2)
d = -3/10
d = -3/10
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