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b in (-oo:+oo)
b-(7*b)-5 = 67 // - 67
b-(7*b)-67-5 = 0
b-7*b-67-5 = 0
-6*b-72 = 0 // + 72
-6*b = 72 // : -6
b = 72/(-6)
b = -12
b = -12
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