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w in (-oo:+oo)
2*w+1/5 = 39/20 // - 39/20
2*w+1/5-(39/20) = 0
2*w+1/5-39/20 = 0
2*w-7/4 = 0 // + 7/4
2*w = 7/4 // : 2
w = 7/4/2
w = 7/8
w = 7/8
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