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w in (-oo:+oo)
-2*w-2 = 7*w-38 // - 7*w-38
38-2*w-(7*w)-2 = 0
38-2*w-7*w-2 = 0
36-9*w = 0 // - 36
-9*w = -36 // : -9
w = -36/(-9)
w = 4
w = 4
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