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w in (-oo:+oo)
3*w-w+1 = 8/5 // - 8/5
3*w-w-(8/5)+1 = 0
3*w-w-8/5+1 = 0
2*w-3/5 = 0 // + 3/5
2*w = 3/5 // : 2
w = 3/5/2
w = 3/10
w = 3/10
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