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b in (-oo:+oo)
7*b+7 = -3*b-113 // + -3*b-113
7*b-(-3*b)+7+113 = 0
7*b+3*b+7+113 = 0
10*b+120 = 0 // - 120
10*b = -120 // : 10
b = -120/10
b = -12
b = -12
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