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b in (-oo:+oo)
4*b-(2*b)-5 = 7 // - 7
4*b-(2*b)-7-5 = 0
4*b-2*b-7-5 = 0
2*b-12 = 0 // + 12
2*b = 12 // : 2
b = 12/2
b = 6
b = 6
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