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b in (-oo:+oo)
5*b+7 = 43-7*b // - 43-7*b
5*b-(-7*b)-43+7 = 0
5*b+7*b-43+7 = 0
12*b-36 = 0 // + 36
12*b = 36 // : 12
b = 36/12
b = 3
b = 3
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