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w in (-oo:+oo)
2*w+1/5 = 19/20 // - 19/20
2*w+1/5-(19/20) = 0
2*w+1/5-19/20 = 0
2*w-3/4 = 0 // + 3/4
2*w = 3/4 // : 2
w = 3/4/2
w = 3/8
w = 3/8
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