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w in (-oo:+oo)
20 = 8*w+w+7/4-(7/8) // - 8*w+w+7/4-(7/8)
7/8-(8*w)-w-(7/4)+20 = 0
7/8-8*w-w-7/4+20 = 0
153/8-9*w = 0 // - 153/8
-9*w = -153/8 // : -9
w = -153/8/(-9)
w = 17/8
w = 17/8
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