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w in (-oo:+oo)
-(7*w)-(7*w)-5 = -89 // + 89
89-(7*w)-(7*w)-5 = 0
89-7*w-7*w-5 = 0
84-14*w = 0 // - 84
-14*w = -84 // : -14
w = -84/(-14)
w = 6
w = 6
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