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w in (-oo:+oo)
4 = 8-2*w-(2*w) // - 8-2*w-(2*w)
2*w-(-2*w)-8+4 = 0
2*w+2*w-8+4 = 0
4*w-4 = 0 // + 4
4*w = 4 // : 4
w = 4/4
w = 1
w = 1
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