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b in (-oo:+oo)
b+9 = 25-3*b // - 25-3*b
b-(-3*b)-25+9 = 0
b+3*b-25+9 = 0
4*b-16 = 0 // + 16
4*b = 16 // : 4
b = 16/4
b = 4
b = 4
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