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w in (-oo:+oo)
-107/7 = w-(4*w)-(2/7) // - w-(4*w)-(2/7)
4*w-w-107/7+2/7 = 0
3*w-15 = 0 // + 15
3*w = 15 // : 3
w = 15/3
w = 5
w = 5
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