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w in (-oo:+oo)
(-1/7)*w+8 = 166/21 // - 166/21
(-1/7)*w-(166/21)+8 = 0
(-1/7)*w-166/21+8 = 0
2/21-1/7*w = 0 // - 2/21
-1/7*w = -2/21 // : -1/7
w = -2/21/(-1/7)
w = 2/3
w = 2/3
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