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