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b in (-oo:+oo)
5-7*b = -(4*b)-28 // + -(4*b)-28
4*b-7*b+5+28 = 0
33-3*b = 0 // - 33
-3*b = -33 // : -3
b = -33/(-3)
b = 11
b = 11
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