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b in (-oo:+oo)
2/5-3*b = 3*b+27/5 // - 3*b+27/5
2/5-3*b-(3*b)-(27/5) = 0
2/5-3*b-3*b-27/5 = 0
-6*b-5 = 0 // + 5
-6*b = 5 // : -6
b = 5/(-6)
b = -5/6
b = -5/6
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