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w in (-oo:+oo)
w/2-790 = 1400 // - 1400
w/2-1400-790 = 0
1/2*w-2190 = 0 // + 2190
1/2*w = 2190 // : 1/2
w = 2190/1/2
w = 4380
w = 4380
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