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w in (-oo:+oo)
1/10-(2*w) = -239/10 // + -239/10
1/10-(2*w)-(-239/10) = 0
1/10-2*w+239/10 = 0
24-2*w = 0 // - 24
-2*w = -24 // : -2
w = -24/(-2)
w = 12
w = 12
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