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w in (-oo:+oo)
2*w = 4/3 // - 4/3
2*w-(4/3) = 0
2*w-4/3 = 0
2*w-4/3 = 0 // + 4/3
2*w = 4/3 // : 2
w = 4/3/2
w = 2/3
w = 2/3
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