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