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b in (-oo:+oo)
5*(-5*b-8) = 135 // - 135
5*(-5*b-8)-135 = 0
5*(-5*b-8)-135 = 0
-25*b-175 = 0
-25*b-175 = 0
-25*b-175 = 0 // + 175
-25*b = 175 // : -25
b = 175/(-25)
b = -7
b = -7
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