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w in (-oo:+oo)
w/2+1 = -1.56 // + 1.56
w/2+1+1.56 = 0
1/2*w+2.56 = 0 // - 2.56
1/2*w = -2.56 // : 1/2
w = -2.56/1/2
w = -5.12
w = -5.12
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