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w in (-oo:+oo)
2*w+9/5 = w+2/5-2 // - w+2/5-2
2*w-w+9/5-(2/5)+2 = 0
2*w-w+9/5-2/5+2 = 0
w+17/5 = 0 // - 17/5
w = -17/5
w = -17/5
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