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x in (-oo:+oo)
x-(2/3) = 2*x-13/12 // - 2*x-13/12
x-(2*x)-(2/3)-(-13/12) = 0
x-2*x-2/3+13/12 = 0
5/12-x = 0 // - 5/12
-x = -5/12 // * -1
x = 5/12
x = 5/12
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