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b in (-oo:+oo)
b/15 = -4/5 // + -4/5
b/15-(-4/5) = 0
b/15+4/5 = 0
1/15*b+4/5 = 0 // - 4/5
1/15*b = -4/5 // : 1/15
b = -4/5/1/15
b = -12
b = -12
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