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d in (-oo:+oo)
(1/2)*d+d+3 = 18/5 // - 18/5
(1/2)*d+d-(18/5)+3 = 0
(1/2)*d+d-18/5+3 = 0
3/2*d-3/5 = 0 // + 3/5
3/2*d = 3/5 // : 3/2
d = 3/5/3/2
d = 2/5
d = 2/5
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