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x in (-oo:+oo)
x/2.55 = 2 // - 2
x/2.55-2 = 0
0.39215686*x-2 = 0 // + 2
0.39215686*x = 2 // : 0.39215686
x = 2/0.39215686
x = 5.10000004
x = 5.10000004
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