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w in (-oo:+oo)
10-w = 7*w-78 // - 7*w-78
10-w-(7*w)+78 = 0
10-w-7*w+78 = 0
88-8*w = 0 // - 88
-8*w = -88 // : -8
w = -88/(-8)
w = 11
w = 11
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