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d in (-oo:+oo)
-((2/5)*d)-1/2 = -8/15 // + -8/15
-((2/5)*d)-1/2-(-8/15) = 0
(-2/5)*d-1/2+8/15 = 0
1/30-2/5*d = 0 // - 1/30
-2/5*d = -1/30 // : -2/5
d = -1/30/(-2/5)
d = 1/12
d = 1/12
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