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w in (-oo:+oo)
6*w+9 = 93/11 // - 93/11
6*w-(93/11)+9 = 0
6*w-93/11+9 = 0
6*w+6/11 = 0 // - 6/11
6*w = -6/11 // : 6
w = -6/11/6
w = -1/11
w = -1/11
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