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w in (-oo:+oo)
(-1/4)*w-1 = 6 // - 6
(-1/4)*w-6-1 = 0
-1/4*w-7 = 0 // + 7
-1/4*w = 7 // : -1/4
w = 7/(-1/4)
w = -28
w = -28
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