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x in (-oo:+oo)
5 = x/2.2 // - x/2.2
5-(x/2.2) = 0
5-0.45454545*x = 0
5-0.45454545*x = 0 // - 5
-0.45454545*x = -5 // : -0.45454545
x = -5/(-0.45454545)
x = 11.00000011
x = 11.00000011
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