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w in (-oo:+oo)
7*w+1/5 = -139/5 // + -139/5
7*w+1/5-(-139/5) = 0
7*w+1/5+139/5 = 0
7*w+28 = 0 // - 28
7*w = -28 // : 7
w = -28/7
w = -4
w = -4
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