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b in (-oo:+oo)
8 = 2*(1/3)*b // - 2*(1/3)*b
8-(2*(1/3)*b) = 0
(-2/3)*b+8 = 0
8-2/3*b = 0 // - 8
-2/3*b = -8 // : -2/3
b = -8/(-2/3)
b = 12
b = 12
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