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w in (-oo:+oo)
2*w+8 = 58/7 // - 58/7
2*w-(58/7)+8 = 0
2*w-58/7+8 = 0
2*w-2/7 = 0 // + 2/7
2*w = 2/7 // : 2
w = 2/7/2
w = 1/7
w = 1/7
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