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w in (-oo:+oo)
-7*w = -14/9 // + -14/9
-7*w-(-14/9) = 0
14/9-7*w = 0
14/9-7*w = 0 // - 14/9
-7*w = -14/9 // : -7
w = -14/9/(-7)
w = 2/9
w = 2/9
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