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w in (-oo:+oo)
3/43-((1/2)*w)-4 = 12 // - 12
3/43-((1/2)*w)-12-4 = 0
(-1/2)*w+3/43-12-4 = 0
-1/2*w-685/43 = 0 // + 685/43
-1/2*w = 685/43 // : -1/2
w = 685/43/(-1/2)
w = -1370/43
w = -1370/43
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