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w in (-oo:+oo)
4*w-(2*w)-1 = 3 // - 3
4*w-(2*w)-3-1 = 0
4*w-2*w-3-1 = 0
2*w-4 = 0 // + 4
2*w = 4 // : 2
w = 4/2
w = 2
w = 2
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