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w in (-oo:+oo)
-((5/7)*w)-7 = -157/21 // + -157/21
-((5/7)*w)-(-157/21)-7 = 0
(-5/7)*w+157/21-7 = 0
10/21-5/7*w = 0 // - 10/21
-5/7*w = -10/21 // : -5/7
w = -10/21/(-5/7)
w = 2/3
w = 2/3
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