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