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