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W in (-oo:+oo)
(-1/4)*W+15 = 28 // - 28
(-1/4)*W-28+15 = 0
-1/4*W-13 = 0 // + 13
-1/4*W = 13 // : -1/4
W = 13/(-1/4)
W = -52
W = -52
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