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w in (-oo:+oo)
4*w+1/2 = w-(17/2) // - w-(17/2)
4*w-w+1/2+17/2 = 0
3*w+9 = 0 // - 9
3*w = -9 // : 3
w = -9/3
w = -3
w = -3
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