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z in (-oo:+oo)
7*z+3/7 = 8*z+1/7 // - 8*z+1/7
7*z-(8*z)+3/7-(1/7) = 0
7*z-8*z+3/7-1/7 = 0
2/7-z = 0 // - 2/7
-z = -2/7 // * -1
z = 2/7
z = 2/7
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