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x in (-oo:+oo)
-x-(2/7) = -36/77 // + -36/77
-x-(2/7)-(-36/77) = 0
36/77-x-2/7 = 0
2/11-x = 0 // - 2/11
-x = -2/11 // * -1
x = 2/11
x = 2/11
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