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b in (-oo:+oo)
6*b+3/5 = -9/5 // + -9/5
6*b+3/5-(-9/5) = 0
6*b+3/5+9/5 = 0
6*b+12/5 = 0 // - 12/5
6*b = -12/5 // : 6
b = -12/5/6
b = -2/5
b = -2/5
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