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b in (-oo:+oo)
5*b-9 = -3*b-25 // + -3*b-25
5*b-(-3*b)-9+25 = 0
5*b+3*b-9+25 = 0
8*b+16 = 0 // - 16
8*b = -16 // : 8
b = -16/8
b = -2
b = -2
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