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x in (-oo:+oo)
16/40 = x/27 // - x/27
16/40-(x/27) = 0
2/5-1/27*x = 0 // - 2/5
-1/27*x = -2/5 // : -1/27
x = -2/5/(-1/27)
x = 54/5
x = 54/5
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