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x in (-oo:+oo)
9/11 = x/4 // - x/4
9/11-(x/4) = 0
9/11-1/4*x = 0 // - 9/11
-1/4*x = -9/11 // : -1/4
x = -9/11/(-1/4)
x = 36/11
x = 36/11
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