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w in (-oo:+oo)
2*w+4 = 5/2 // - 5/2
2*w-(5/2)+4 = 0
2*w-5/2+4 = 0
2*w+3/2 = 0 // - 3/2
2*w = -3/2 // : 2
w = -3/2/2
w = -3/4
w = -3/4
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