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b in (-oo:+oo)
4*b-(2/5) = 6*b-(7/5) // - 6*b-(7/5)
4*b-(6*b)-(2/5)+7/5 = 0
4*b-6*b-2/5+7/5 = 0
1-2*b = 0 // - 1
-2*b = -1 // : -2
b = -1/(-2)
b = 1/2
b = 1/2
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