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