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b in (-oo:+oo)
2-7*b-(3*b) = -118 // + 118
2-7*b-(3*b)+118 = 0
2-7*b-3*b+118 = 0
120-10*b = 0 // - 120
-10*b = -120 // : -10
b = -120/(-10)
b = 12
b = 12
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