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x in (-oo:+oo)
(1/2)*x-1 = x-(3/5) // - x-(3/5)
(1/2)*x-x+3/5-1 = 0
-1/2*x-2/5 = 0 // + 2/5
-1/2*x = 2/5 // : -1/2
x = 2/5/(-1/2)
x = -4/5
x = -4/5
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