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d in (-oo:+oo)
7*(6*d+5) = -343 // + 343
7*(6*d+5)+343 = 0
7*(6*d+5)+343 = 0
42*d+378 = 0
42*d+378 = 0
42*d+378 = 0 // - 378
42*d = -378 // : 42
d = -378/42
d = -9
d = -9
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