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x in (-oo:+oo)
(x/1)/2 = 5/4.5 // - 5/4.5
(x/1)/2-(5/4.5) = 0
x/2-1.11111111 = 0
1/2*x-1.11111111 = 0 // + 1.11111111
1/2*x = 1.11111111 // : 1/2
x = 1.11111111/1/2
x = 2.22222222
x = 2.22222222
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