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z in (-oo:+oo)
z/9.3 = 2.3/0.3 // - 2.3/0.3
z/9.3-(2.3/0.3) = 0
z/9.3-7.66666667 = 0
0.10752688*z-7.66666667 = 0 // + 7.66666667
0.10752688*z = 7.66666667 // : 0.10752688
z = 7.66666667/0.10752688
z = 71.30000117
z = 71.30000117
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