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z in (-oo:+oo)
-7*z-(5*z) = 6/7 // - 6/7
-7*z-(5*z)-(6/7) = 0
-7*z-5*z-6/7 = 0
-12*z-6/7 = 0 // + 6/7
-12*z = 6/7 // : -12
z = 6/7/(-12)
z = -1/14
z = -1/14
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