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b in (-oo:+oo)
(2/5)*b-6 = -89/15 // + -89/15
(2/5)*b-(-89/15)-6 = 0
(2/5)*b+89/15-6 = 0
2/5*b-1/15 = 0 // + 1/15
2/5*b = 1/15 // : 2/5
b = 1/15/2/5
b = 1/6
b = 1/6
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