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w in (-oo:+oo)
15*(-w/4) = 28 // - 28
15*(-w/4)-28 = 0
-15/4*w-28 = 0 // + 28
-15/4*w = 28 // : -15/4
w = 28/(-15/4)
w = -112/15
w = -112/15
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