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b in (-oo:+oo)
1-7*b = 5*b+61 // - 5*b+61
1-7*b-(5*b)-61 = 0
1-7*b-5*b-61 = 0
-12*b-60 = 0 // + 60
-12*b = 60 // : -12
b = 60/(-12)
b = -5
b = -5
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