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b in (-oo:+oo)
5*(-5*b-9) = -195 // + 195
5*(-5*b-9)+195 = 0
5*(-5*b-9)+195 = 0
150-25*b = 0
150-25*b = 0
150-25*b = 0 // - 150
-25*b = -150 // : -25
b = -150/(-25)
b = 6
b = 6
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