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w in (-oo:+oo)
w/5 = -4/7 // + -4/7
w/5-(-4/7) = 0
w/5+4/7 = 0
1/5*w+4/7 = 0 // - 4/7
1/5*w = -4/7 // : 1/5
w = -4/7/1/5
w = -20/7
w = -20/7
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