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w in (-oo:+oo)
(-1/3)*w = -1/9 // + -1/9
(-1/3)*w-(-1/9) = 0
(-1/3)*w+1/9 = 0
1/9-1/3*w = 0 // - 1/9
-1/3*w = -1/9 // : -1/3
w = -1/9/(-1/3)
w = 1/3
w = 1/3
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