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w in (-oo:+oo)
9-(7*w) = 4*w-2 // - 4*w-2
2-(7*w)-(4*w)+9 = 0
2-7*w-4*w+9 = 0
11-11*w = 0 // - 11
-11*w = -11 // : -11
w = -11/(-11)
w = 1
w = 1
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