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w in (-oo:+oo)
5/9-(5*w) = -310/9 // + -310/9
5/9-(5*w)-(-310/9) = 0
5/9-5*w+310/9 = 0
35-5*w = 0 // - 35
-5*w = -35 // : -5
w = -35/(-5)
w = 7
w = 7
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