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w in (-oo:+oo)
12/36 = 2*w // - 2*w
12/36-(2*w) = 0
12/36-2*w = 0
1/3-2*w = 0 // - 1/3
-2*w = -1/3 // : -2
w = -1/3/(-2)
w = 1/6
w = 1/6
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