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d in (-oo:+oo)
(-4/7)*d-3 = -117/35 // + -117/35
(-4/7)*d-(-117/35)-3 = 0
(-4/7)*d+117/35-3 = 0
12/35-4/7*d = 0 // - 12/35
-4/7*d = -12/35 // : -4/7
d = -12/35/(-4/7)
d = 3/5
d = 3/5
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