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d in (-oo:+oo)
7*(6*d-6) = 294 // - 294
7*(6*d-6)-294 = 0
7*(6*d-6)-294 = 0
42*d-336 = 0
42*d-336 = 0
42*d-336 = 0 // + 336
42*d = 336 // : 42
d = 336/42
d = 8
d = 8
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