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b in (-oo:+oo)
b-(b/4)+3/3 = b-(2/5) // - b-(2/5)
b-(b/4)-b+3/3+2/5 = 0
7/5-1/4*b = 0 // - 7/5
-1/4*b = -7/5 // : -1/4
b = -7/5/(-1/4)
b = 28/5
b = 28/5
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