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b in (-oo:+oo)
b/8 = 5*b-195 // - 5*b-195
b/8-(5*b)+195 = 0
b/8-5*b+195 = 0
195-39/8*b = 0 // - 195
-39/8*b = -195 // : -39/8
b = -195/(-39/8)
b = 40
b = 40
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