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z in (-oo:+oo)
2*z+2/7 = 3*z+5/7 // - 3*z+5/7
2*z-(3*z)+2/7-(5/7) = 0
2*z-3*z+2/7-5/7 = 0
-z-3/7 = 0 // + 3/7
-z = 3/7 // * -1
z = -3/7
z = -3/7
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