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w in (-oo:+oo)
2/5-((1/3)*w)-(1/4) = 0
(-1/3)*w+2/5-1/4 = 0
3/20-1/3*w = 0 // - 3/20
-1/3*w = -3/20 // : -1/3
w = -3/20/(-1/3)
w = 9/20
w = 9/20
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