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w in (-oo:+oo)
-(w/2)-19 = (1/6)*w-1 // - (1/6)*w-1
1-(w/2)-((1/6)*w)-19 = 0
(-1/6)*w-(w/2)-19+1 = 0
-2/3*w-18 = 0 // + 18
-2/3*w = 18 // : -2/3
w = 18/(-2/3)
w = -27
w = -27
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