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w in (-oo:+oo)
2-((1/2)*w) = 158 // - 158
2-((1/2)*w)-158 = 0
(-1/2)*w-158+2 = 0
-1/2*w-156 = 0 // + 156
-1/2*w = 156 // : -1/2
w = 156/(-1/2)
w = -312
w = -312
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