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x in (-oo:+oo)
X/5+3 = x-(1/t) // - x-(1/t)
X/5+1/t-x+3 = 0
1/5*X+t^-1-x+3 = 0 // - 1/5*X+t^-1+3
-x = -(1/5*X+t^-1+3) // * -1
x = 1/5*X+t^-1+3
x = 1/5*X+t^-1+3
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