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b in (-oo:+oo)
1-7*b = 5*b-107 // - 5*b-107
1-7*b-(5*b)+107 = 0
1-7*b-5*b+107 = 0
108-12*b = 0 // - 108
-12*b = -108 // : -12
b = -108/(-12)
b = 9
b = 9
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