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