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w in (-oo:+oo)
-(7*w)-1 = 76 // - 76
-(7*w)-76-1 = 0
-7*w-76-1 = 0
-7*w-77 = 0 // + 77
-7*w = 77 // : -7
w = 77/(-7)
w = -11
w = -11
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