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x in (-oo:+oo)
4*x = 28/11 // - 28/11
4*x-(28/11) = 0
4*x-28/11 = 0
4*x-28/11 = 0 // + 28/11
4*x = 28/11 // : 4
x = 28/11/4
x = 7/11
x = 7/11
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