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x in (-oo:+oo)
5/7-(70/30) = x // - x
5/7-x-(70/30) = 0
5/7-x-7/3 = 0
-x-34/21 = 0 // + 34/21
-x = 34/21 // * -1
x = -34/21
x = -34/21
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