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w in (-oo:+oo)
-30 = w/4-2 // - w/4-2
2-(w/4)-30 = 0
-1/4*w-28 = 0 // + 28
-1/4*w = 28 // : -1/4
w = 28/(-1/4)
w = -112
w = -112
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