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