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b in (-oo:+oo)
5*b-(7*b)-4 = 14 // - 14
5*b-(7*b)-14-4 = 0
5*b-7*b-14-4 = 0
-2*b-18 = 0 // + 18
-2*b = 18 // : -2
b = 18/(-2)
b = -9
b = -9
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