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b in (-oo:+oo)
-56 = 7-3*b-(6*b) // - 7-3*b-(6*b)
6*b-(-3*b)-56-7 = 0
3*b+6*b-56-7 = 0
9*b-63 = 0 // + 63
9*b = 63 // : 9
b = 63/9
b = 7
b = 7
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