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b in (-oo:+oo)
3*b-((3*b)/8) = -36 // + 36
3*b-((3*b)/8)+36 = 0
3*b+(-3/8)*b+36 = 0
21/8*b+36 = 0 // - 36
21/8*b = -36 // : 21/8
b = -36/21/8
b = -96/7
b = -96/7
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