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x in (-oo:+oo)
7/9 = x/27 // - x/27
7/9-(x/27) = 0
7/9-1/27*x = 0 // - 7/9
-1/27*x = -7/9 // : -1/27
x = -7/9/(-1/27)
x = 21
x = 21
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