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w in (-oo:+oo)
-9 = w/4-3 // - w/4-3
3-(w/4)-9 = 0
-1/4*w-6 = 0 // + 6
-1/4*w = 6 // : -1/4
w = 6/(-1/4)
w = -24
w = -24
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