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w in (-oo:+oo)
w+(1/6)*w+1/6 = (-1/6)*(w-(3/7)) // - (-1/6)*(w-(3/7))
w-((-1/6)*(w-(3/7)))+(1/6)*w+1/6 = 0
(1/6)*(w-3/7)+w+(1/6)*w+1/6 = 0
1/6*(w-3/7)+w+w/6+1/6 = 0
(1/6*6*(w-3/7))/6+(6*w)/6+w/6+1/6 = 0
1/6*6*(w-3/7)+6*w+w+1 = 0
7*w+w-3/7+1 = 0
8*w-3/7+1 = 0
8*w+4/7 = 0
(8*w+4/7)/6 = 0
(8*w+4/7)/6 = 0 // * 6
8*w+4/7 = 0
8*w+4/7 = 0 // - 4/7
8*w = -4/7 // : 8
w = -4/7/8
w = -1/14
w = -1/14
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