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x in (-oo:+oo)
5/6.5 = x/11 // - x/11
5/6.5-(x/11) = 0
0.76923077-1/11*x = 0 // - 0.76923077
-1/11*x = -0.76923077 // : -1/11
x = -0.76923077/(-1/11)
x = 8.46153855
x = 8.46153855
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