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w in (-oo:+oo)
-31 = -w/2 // + -w/2
-(-w/2)-31 = 0
(1/2)*w-31 = 0
1/2*w-31 = 0 // + 31
1/2*w = 31 // : 1/2
w = 31/1/2
w = 62
w = 62
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