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x in (-oo:+oo)
4/5-2*x = 9/5 // - 9/5
4/5-2*x-(9/5) = 0
4/5-2*x-9/5 = 0
-2*x-1 = 0 // + 1
-2*x = 1 // : -2
x = 1/(-2)
x = -1/2
x = -1/2
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