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d in (-oo:+oo)
-74/35 = (-2/7)*d+(3/5)*d-4 // - (-2/7)*d+(3/5)*d-4
4-((-2/7)*d)-((3/5)*d)-74/35 = 0
(2/7)*d+(-3/5)*d-74/35+4 = 0
66/35-11/35*d = 0 // - 66/35
-11/35*d = -66/35 // : -11/35
d = -66/35/(-11/35)
d = 6
d = 6
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