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b in (-oo:+oo)
(2/3)*b+6 = 88/15 // - 88/15
(2/3)*b-(88/15)+6 = 0
(2/3)*b-88/15+6 = 0
2/3*b+2/15 = 0 // - 2/15
2/3*b = -2/15 // : 2/3
b = -2/15/2/3
b = -1/5
b = -1/5
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