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w in (-oo:+oo)
(-1/7)*w+6 = 34/7 // - 34/7
(-1/7)*w-(34/7)+6 = 0
(-1/7)*w-34/7+6 = 0
8/7-1/7*w = 0 // - 8/7
-1/7*w = -8/7 // : -1/7
w = -8/7/(-1/7)
w = 8
w = 8
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