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b in (-oo:+oo)
b-(4*b)+10 = 25 // - 25
b-(4*b)-25+10 = 0
b-4*b-25+10 = 0
-3*b-15 = 0 // + 15
-3*b = 15 // : -3
b = 15/(-3)
b = -5
b = -5
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