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b in (-oo:+oo)
3*b+10/(-1) = b/3 // - b/3
3*b-(b/3)+10/(-1) = 0
3*b-(b/3)-10 = 0
8/3*b-10 = 0 // + 10
8/3*b = 10 // : 8/3
b = 10/8/3
b = 15/4
b = 15/4
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