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w in (-oo:+oo)
-15.9 = w/4-3.1 // - w/4-3.1
3.1-(w/4)-15.9 = 0
-1/4*w-12.8 = 0 // + 12.8
-1/4*w = 12.8 // : -1/4
w = 12.8/(-1/4)
w = -51.2
w = -51.2
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