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w in (-oo:+oo)
8 = 7*w-(6*w)-2 // - 7*w-(6*w)-2
6*w-(7*w)+2+8 = 0
6*w-7*w+2+8 = 0
10-w = 0 // - 10
-w = -10 // * -1
w = 10
w = 10
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