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w in (-oo:+oo)
w/2 = 1.5 // - 1.5
w/2-1.5 = 0
1/2*w-1.5 = 0 // + 1.5
1/2*w = 1.5 // : 1/2
w = 1.5/1/2
w = 3
w = 3
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