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w in (-oo:+oo)
3*w+1/2 = w-(3/10) // - w-(3/10)
3*w-w+1/2+3/10 = 0
2*w+4/5 = 0 // - 4/5
2*w = -4/5 // : 2
w = -4/5/2
w = -2/5
w = -2/5
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