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w in (-oo:+oo)
-5*w-(7/9) = -502/9 // + -502/9
-5*w-(7/9)-(-502/9) = 0
502/9-5*w-7/9 = 0
55-5*w = 0 // - 55
-5*w = -55 // : -5
w = -55/(-5)
w = 11
w = 11
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