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d in (-oo:+oo)
(2/5)*d-d+3/4 = 117/220 // - 117/220
(2/5)*d-d+3/4-(117/220) = 0
(2/5)*d-d+3/4-117/220 = 0
12/55-3/5*d = 0 // - 12/55
-3/5*d = -12/55 // : -3/5
d = -12/55/(-3/5)
d = 4/11
d = 4/11
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