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d in (-oo:+oo)
4*d+3/7 = 7*d+129/7 // - 7*d+129/7
4*d-(7*d)+3/7-(129/7) = 0
4*d-7*d+3/7-129/7 = 0
-3*d-18 = 0 // + 18
-3*d = 18 // : -3
d = 18/(-3)
d = -6
d = -6
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