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w in (-oo:+oo)
(-1/2)*w+2 = 17/10 // - 17/10
(-1/2)*w-(17/10)+2 = 0
(-1/2)*w-17/10+2 = 0
3/10-1/2*w = 0 // - 3/10
-1/2*w = -3/10 // : -1/2
w = -3/10/(-1/2)
w = 3/5
w = 3/5
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