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