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b in (-oo:+oo)
5-(2*b) = b+23 // - b+23
5-(2*b)-b-23 = 0
5-2*b-b-23 = 0
-3*b-18 = 0 // + 18
-3*b = 18 // : -3
b = 18/(-3)
b = -6
b = -6
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