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b in (-oo:+oo)
7*b+9 = 48-6*b // - 48-6*b
7*b-(-6*b)-48+9 = 0
7*b+6*b-48+9 = 0
13*b-39 = 0 // + 39
13*b = 39 // : 13
b = 39/13
b = 3
b = 3
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