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x in (-oo:+oo)
2/3-(6/7) = x // - x
2/3-x-(6/7) = 0
2/3-x-6/7 = 0
-x-4/21 = 0 // + 4/21
-x = 4/21 // * -1
x = -4/21
x = -4/21
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