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b in (-oo:+oo)
(8/15)*b = -2/3 // + -2/3
(8/15)*b-(-2/3) = 0
(8/15)*b+2/3 = 0
8/15*b+2/3 = 0 // - 2/3
8/15*b = -2/3 // : 8/15
b = -2/3/8/15
b = -5/4
b = -5/4
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