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w in (-oo:+oo)
2*w+3/7 = w+2/7-2 // - w+2/7-2
2*w-w+3/7-(2/7)+2 = 0
2*w-w+3/7-2/7+2 = 0
w+15/7 = 0 // - 15/7
w = -15/7
w = -15/7
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