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b in (-oo:+oo)
5-(2*b)-(4*b) = -13 // + 13
5-(2*b)-(4*b)+13 = 0
5-2*b-4*b+13 = 0
18-6*b = 0 // - 18
-6*b = -18 // : -6
b = -18/(-6)
b = 3
b = 3
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