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w in (-oo:+oo)
w/2 = -5/6 // + -5/6
w/2-(-5/6) = 0
w/2+5/6 = 0
1/2*w+5/6 = 0 // - 5/6
1/2*w = -5/6 // : 1/2
w = -5/6/1/2
w = -5/3
w = -5/3
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