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w in (-oo:+oo)
2*w+5 = 20/3 // - 20/3
2*w-(20/3)+5 = 0
2*w-20/3+5 = 0
2*w-5/3 = 0 // + 5/3
2*w = 5/3 // : 2
w = 5/3/2
w = 5/6
w = 5/6
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