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