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w in (-oo:+oo)
-2.8 = w/4 // - w/4
-(w/4)-2.8 = 0
-1/4*w-2.8 = 0 // + 2.8
-1/4*w = 2.8 // : -1/4
w = 2.8/(-1/4)
w = -11.2
w = -11.2
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