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b in (-oo:+oo)
7*(6*b+7) = 553 // - 553
7*(6*b+7)-553 = 0
7*(6*b+7)-553 = 0
42*b-504 = 0
42*b-504 = 0
42*b-504 = 0 // + 504
42*b = 504 // : 42
b = 504/42
b = 12
b = 12
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