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w in (-oo:+oo)
-5*w = -5/2 // + -5/2
-5*w-(-5/2) = 0
5/2-5*w = 0
5/2-5*w = 0 // - 5/2
-5*w = -5/2 // : -5
w = -5/2/(-5)
w = 1/2
w = 1/2
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