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x in (-oo:+oo)
5/30 = x/27 // - x/27
5/30-(x/27) = 0
1/6-1/27*x = 0 // - 1/6
-1/27*x = -1/6 // : -1/27
x = -1/6/(-1/27)
x = 9/2
x = 9/2
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