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w in (-oo:+oo)
w-((3/7)*w)+5/9 = -109/63 // + -109/63
w-((3/7)*w)+5/9-(-109/63) = 0
(-3/7)*w+w+5/9+109/63 = 0
4/7*w+16/7 = 0 // - 16/7
4/7*w = -16/7 // : 4/7
w = -16/7/4/7
w = -4
w = -4
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