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b in (-oo:+oo)
86 = 7*b+5*b-10 // - 7*b+5*b-10
10-(7*b)-(5*b)+86 = 0
10-7*b-5*b+86 = 0
96-12*b = 0 // - 96
-12*b = -96 // : -12
b = -96/(-12)
b = 8
b = 8
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