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w in (-oo:+oo)
6*w+7/9 = 4*w+205/9 // - 4*w+205/9
6*w-(4*w)+7/9-(205/9) = 0
6*w-4*w+7/9-205/9 = 0
2*w-22 = 0 // + 22
2*w = 22 // : 2
w = 22/2
w = 11
w = 11
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