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w in (-oo:+oo)
-7*w = 14/5 // - 14/5
-7*w-(14/5) = 0
-7*w-14/5 = 0
-7*w-14/5 = 0 // + 14/5
-7*w = 14/5 // : -7
w = 14/5/(-7)
w = -2/5
w = -2/5
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