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w in (-oo:+oo)
-w-((1/2)*w)-1 = -10 // + 10
10-w-((1/2)*w)-1 = 0
(-1/2)*w-w-1+10 = 0
9-3/2*w = 0 // - 9
-3/2*w = -9 // : -3/2
w = -9/(-3/2)
w = 6
w = 6
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