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d in (-oo:+oo)
-1121/385 = 7*d+(2/7)*d+2/5 // - 7*d+(2/7)*d+2/5
-(7*d)-((2/7)*d)-1121/385-(2/5) = 0
(-2/7)*d-7*d-1121/385-2/5 = 0
-51/7*d-255/77 = 0 // + 255/77
-51/7*d = 255/77 // : -51/7
d = 255/77/(-51/7)
d = -5/11
d = -5/11
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