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x in (-oo:+oo)
4/7 = x-(3/1) // - x-(3/1)
4/7-x+3/1 = 0
4/7-x+3 = 0
25/7-x = 0 // - 25/7
-x = -25/7 // * -1
x = 25/7
x = 25/7
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