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x in (-oo:+oo)
x/2 = x-(4/5) // - x-(4/5)
x/2-x+4/5 = 0
4/5-1/2*x = 0 // - 4/5
-1/2*x = -4/5 // : -1/2
x = -4/5/(-1/2)
x = 8/5
x = 8/5
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