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W in (-oo:+oo)
W/3-(2/5) = 2 // - 2
W/3-(2/5)-2 = 0
W/3-2/5-2 = 0
1/3*W-12/5 = 0 // + 12/5
1/3*W = 12/5 // : 1/3
W = 12/5/1/3
W = 36/5
W = 36/5
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