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b in (-oo:+oo)
5*(-(5*b)-5) = -175 // + 175
5*(-(5*b)-5)+175 = 0
5*(-5*b-5)+175 = 0
5*(-5*b-5)+175 = 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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