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b in (-oo:+oo)
3/5-4*b = -17/5 // + -17/5
3/5-4*b-(-17/5) = 0
3/5-4*b+17/5 = 0
4-4*b = 0 // - 4
-4*b = -4 // : -4
b = -4/(-4)
b = 1
b = 1
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