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b in (-oo:+oo)
15-(b/6) = -2/3 // + -2/3
15-(b/6)-(-2/3) = 0
2/3-(b/6)+15 = 0
47/3-1/6*b = 0 // - 47/3
-1/6*b = -47/3 // : -1/6
b = -47/3/(-1/6)
b = 94
b = 94
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