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w in (-oo:+oo)
3/5-5*w-w = 57/20 // - 57/20
3/5-5*w-w-(57/20) = 0
3/5-5*w-w-57/20 = 0
-6*w-9/4 = 0 // + 9/4
-6*w = 9/4 // : -6
w = 9/4/(-6)
w = -3/8
w = -3/8
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