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w in (-oo:+oo)
-((4/7)*w) = 16 // - 16
-((4/7)*w)-16 = 0
(-4/7)*w-16 = 0
-4/7*w-16 = 0 // + 16
-4/7*w = 16 // : -4/7
w = 16/(-4/7)
w = -28
w = -28
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