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z in (-oo:+oo)
4*z+1/4 = 7*z-(8/7) // - 7*z-(8/7)
4*z-(7*z)+1/4+8/7 = 0
4*z-7*z+1/4+8/7 = 0
39/28-3*z = 0 // - 39/28
-3*z = -39/28 // : -3
z = -39/28/(-3)
z = 13/28
z = 13/28
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