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w in (-oo:+oo)
2*w+1 = 7/3 // - 7/3
2*w-(7/3)+1 = 0
2*w-7/3+1 = 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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