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x in (-oo:+oo)
n-(3/3) = x+5/7 // - x+5/7
n-x-(3/3)-(5/7) = 0
n-x-5/7-1 = 0
n-x-12/7 = 0 // - n-12/7
-x = -(n-12/7) // * -1
x = n-12/7
x = n-12/7
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