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w in (-oo:+oo)
w+7 = 7*w+8/5 // - 7*w+8/5
w-(7*w)-(8/5)+7 = 0
w-7*w-8/5+7 = 0
27/5-6*w = 0 // - 27/5
-6*w = -27/5 // : -6
w = -27/5/(-6)
w = 9/10
w = 9/10
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