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