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b in (-oo:+oo)
2*b-(3/5) = (7/5)*b // - (7/5)*b
2*b-((7/5)*b)-(3/5) = 0
2*b+(-7/5)*b-3/5 = 0
3/5*b-3/5 = 0 // + 3/5
3/5*b = 3/5 // : 3/5
b = 3/5/3/5
b = 1
b = 1
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