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w in (-oo:+oo)
(8-(7*w))/7 = (7*(w+2))/6 // - (7*(w+2))/6
(8-(7*w))/7-((7*(w+2))/6) = 0
(8-7*w)/7+(-7/6)*(w+2) = 0
(8-7*w)/7-7/6*(w+2) = 0
(8-7*w)/7+(-7/6*7*(w+2))/7 = 0
8-7/6*7*(w+2)-7*w = 0
-91/6*w-25/3 = 0
(-91/6*w-25/3)/7 = 0
(-91/6*w-25/3)/7 = 0 // * 7
-91/6*w-25/3 = 0
-91/6*w-25/3 = 0 // + 25/3
-91/6*w = 25/3 // : -91/6
w = 25/3/(-91/6)
w = -50/91
w = -50/91
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