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w in (-oo:+oo)
2*w+w-(1/5)+2 = 2*w // - 2*w
2*w+w-(2*w)-(1/5)+2 = 0
2*w+w-2*w-1/5+2 = 0
w+9/5 = 0 // - 9/5
w = -9/5
w = -9/5
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