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d in (-oo:+oo)
6*d-1 = 7*d-(7/4) // - 7*d-(7/4)
6*d-(7*d)+7/4-1 = 0
6*d-7*d+7/4-1 = 0
3/4-d = 0 // - 3/4
-d = -3/4 // * -1
d = 3/4
d = 3/4
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