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w in (-oo:+oo)
3/42-((1/2)*w)-4 = 12 // - 12
3/42-((1/2)*w)-12-4 = 0
(-1/2)*w+3/42-12-4 = 0
-1/2*w-223/14 = 0 // + 223/14
-1/2*w = 223/14 // : -1/2
w = 223/14/(-1/2)
w = -223/7
w = -223/7
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