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x in (-oo:+oo)
2*x-1 = 256/5 // - 256/5
2*x-(256/5)-1 = 0
2*x-256/5-1 = 0
2*x-261/5 = 0 // + 261/5
2*x = 261/5 // : 2
x = 261/5/2
x = 261/10
x = 261/10
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