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w in (-oo:+oo)
-12.1 = w/6+7.1 // - w/6+7.1
-(w/6)-12.1-7.1 = 0
-1/6*w-19.2 = 0 // + 19.2
-1/6*w = 19.2 // : -1/6
w = 19.2/(-1/6)
w = -115.1999977
w = -115.1999977
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