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b in (-oo:+oo)
2/100 = b/(-200) // - b/(-200)
2/100-(b/(-200)) = 0
1/200*b+1/50 = 0 // - 1/50
1/200*b = -1/50 // : 1/200
b = -1/50/1/200
b = -4
b = -4
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