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w in (-oo:+oo)
w/2 = -2/7 // + -2/7
w/2-(-2/7) = 0
w/2+2/7 = 0
1/2*w+2/7 = 0 // - 2/7
1/2*w = -2/7 // : 1/2
w = -2/7/1/2
w = -4/7
w = -4/7
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