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w in (-oo:+oo)
(5/7)*w-(3*w)-6 = -178/35 // + -178/35
(5/7)*w-(3*w)-(-178/35)-6 = 0
(5/7)*w-3*w+178/35-6 = 0
-16/7*w-32/35 = 0 // + 32/35
-16/7*w = 32/35 // : -16/7
w = 32/35/(-16/7)
w = -2/5
w = -2/5
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