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x in (-oo:+oo)
x-(1/2) = 2*x+4/5 // - 2*x+4/5
x-(2*x)-(1/2)-(4/5) = 0
x-2*x-1/2-4/5 = 0
-x-13/10 = 0 // + 13/10
-x = 13/10 // * -1
x = -13/10
x = -13/10
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