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w in (-oo:+oo)
-(7*w)-4 = -11 // + 11
11-(7*w)-4 = 0
11-7*w-4 = 0
7-7*w = 0 // - 7
-7*w = -7 // : -7
w = -7/(-7)
w = 1
w = 1
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