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