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b in (-oo:+oo)
3*b-(2/5) = b-(2/10) // - b-(2/10)
3*b-b-(2/5)+2/10 = 0
3*b-b-2/5+2/10 = 0
2*b-1/5 = 0 // + 1/5
2*b = 1/5 // : 2
b = 1/5/2
b = 1/10
b = 1/10
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