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w in (-oo:+oo)
-4*w = 5/9 // - 5/9
-4*w-(5/9) = 0
-4*w-5/9 = 0
-4*w-5/9 = 0 // + 5/9
-4*w = 5/9 // : -4
w = 5/9/(-4)
w = -5/36
w = -5/36
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