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b in (-oo:+oo)
7-(5*b)-(6*b) = -59 // + 59
7-(5*b)-(6*b)+59 = 0
7-5*b-6*b+59 = 0
66-11*b = 0 // - 66
-11*b = -66 // : -11
b = -66/(-11)
b = 6
b = 6
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