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b in (-oo:+oo)
4*b-(2/5) = -6/5 // + -6/5
4*b-(2/5)-(-6/5) = 0
4*b-2/5+6/5 = 0
4*b+4/5 = 0 // - 4/5
4*b = -4/5 // : 4
b = -4/5/4
b = -1/5
b = -1/5
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