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x in (-oo:+oo)
2*x = 1/128 // - 1/128
2*x-(1/128) = 0
2*x-1/128 = 0
2*x-1/128 = 0 // + 1/128
2*x = 1/128 // : 2
x = 1/128/2
x = 1/256
x = 1/256
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