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w in (-oo:+oo)
8-(w/10) = 2/5 // - 2/5
8-(w/10)-(2/5) = 0
8-(w/10)-2/5 = 0
38/5-1/10*w = 0 // - 38/5
-1/10*w = -38/5 // : -1/10
w = -38/5/(-1/10)
w = 76
w = 76
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