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z in (-oo:+oo)
z/1.3 = 0.7 // - 0.7
z/1.3-0.7 = 0
0.76923077*z-0.7 = 0 // + 0.7
0.76923077*z = 0.7 // : 0.76923077
z = 0.7/0.76923077
z = 0.91
z = 0.91
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