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b in (-oo:+oo)
2*b-(4*b)-3 = -13 // + 13
2*b-(4*b)-3+13 = 0
2*b-4*b-3+13 = 0
10-2*b = 0 // - 10
-2*b = -10 // : -2
b = -10/(-2)
b = 5
b = 5
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