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x in (-oo:+oo)
25/135 = x/27 // - x/27
25/135-(x/27) = 0
5/27-1/27*x = 0 // - 5/27
-1/27*x = -5/27 // : -1/27
x = -5/27/(-1/27)
x = 5
x = 5
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