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w in (-oo:+oo)
-14.9 = w/8-2.1 // - w/8-2.1
2.1-(w/8)-14.9 = 0
-1/8*w-12.8 = 0 // + 12.8
-1/8*w = 12.8 // : -1/8
w = 12.8/(-1/8)
w = -102.4
w = -102.4
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