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