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w in (-oo:+oo)
-4 = w/2+15 // - w/2+15
-(w/2)-15-4 = 0
-1/2*w-19 = 0 // + 19
-1/2*w = 19 // : -1/2
w = 19/(-1/2)
w = -38
w = -38
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