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x in (-oo:+oo)
x/2.56+3 = 5 // - 5
x/2.56-5+3 = 0
0.390625*x-2 = 0 // + 2
0.390625*x = 2 // : 0.390625
x = 2/0.390625
x = 5.12
x = 5.12
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