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