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w in (-oo:+oo)
w+4*w-(4/7) = 201/77 // - 201/77
w+4*w-(4/7)-(201/77) = 0
w+4*w-4/7-201/77 = 0
5*w-35/11 = 0 // + 35/11
5*w = 35/11 // : 5
w = 35/11/5
w = 7/11
w = 7/11
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