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w in (-oo:+oo)
-w-10 = -76/7 // + -76/7
-w-(-76/7)-10 = 0
76/7-w-10 = 0
6/7-w = 0 // - 6/7
-w = -6/7 // * -1
w = 6/7
w = 6/7
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