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x in (-oo:+oo)
-6/5 = 4/5-x-(5*x) // - 4/5-x-(5*x)
x+5*x-6/5-(4/5) = 0
x+5*x-6/5-4/5 = 0
6*x-2 = 0 // + 2
6*x = 2 // : 6
x = 2/6
x = 1/3
x = 1/3
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