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d in (-oo:+oo)
6*(7*d+6) = 330 // - 330
6*(7*d+6)-330 = 0
6*(7*d+6)-330 = 0
42*d-294 = 0
42*d-294 = 0
42*d-294 = 0 // + 294
42*d = 294 // : 42
d = 294/42
d = 7
d = 7
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