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w in (-oo:+oo)
10-4*w = 4*w+82 // - 4*w+82
10-4*w-(4*w)-82 = 0
10-4*w-4*w-82 = 0
-8*w-72 = 0 // + 72
-8*w = 72 // : -8
w = 72/(-8)
w = -9
w = -9
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