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w in (-oo:+oo)
5-((4/7)*w) = 8 // - 8
5-((4/7)*w)-8 = 0
(-4/7)*w-8+5 = 0
-4/7*w-3 = 0 // + 3
-4/7*w = 3 // : -4/7
w = 3/(-4/7)
w = -21/4
w = -21/4
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