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w in (-oo:+oo)
-((5/7)*w) = 10 // - 10
-((5/7)*w)-10 = 0
(-5/7)*w-10 = 0
-5/7*w-10 = 0 // + 10
-5/7*w = 10 // : -5/7
w = 10/(-5/7)
w = -14
w = -14
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