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x in (-oo:+oo)
2*x = 4/5 // - 4/5
2*x-(4/5) = 0
2*x-4/5 = 0
2*x-4/5 = 0 // + 4/5
2*x = 4/5 // : 2
x = 4/5/2
x = 2/5
x = 2/5
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