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w in (-oo:+oo)
0 = w+7*w-2 // - w+7*w-2
0-w-(7*w)+2 = 0
0-w-7*w+2 = 0
2-8*w = 0 // - 2
-8*w = -2 // : -8
w = -2/(-8)
w = 1/4
w = 1/4
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