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x in (-oo:+oo)
3/7-(5/7) = x // - x
3/7-x-(5/7) = 0
3/7-x-5/7 = 0
-x-2/7 = 0 // + 2/7
-x = 2/7 // * -1
x = -2/7
x = -2/7
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