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w in (-oo:+oo)
1-7*w = 26/5 // - 26/5
1-7*w-(26/5) = 0
1-7*w-26/5 = 0
-7*w-21/5 = 0 // + 21/5
-7*w = 21/5 // : -7
w = 21/5/(-7)
w = -3/5
w = -3/5
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