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b in (-oo:+oo)
7*b+4 = 116-7*b // - 116-7*b
7*b-(-7*b)-116+4 = 0
7*b+7*b-116+4 = 0
14*b-112 = 0 // + 112
14*b = 112 // : 14
b = 112/14
b = 8
b = 8
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