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b in (-oo:+oo)
2/3 = (8/3)*b // - (8/3)*b
2/3-((8/3)*b) = 0
(-8/3)*b+2/3 = 0
2/3-8/3*b = 0 // - 2/3
-8/3*b = -2/3 // : -8/3
b = -2/3/(-8/3)
b = 1/4
b = 1/4
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