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z in (-oo:+oo)
z/3.5 = 6 // - 6
z/3.5-6 = 0
0.28571429*z-6 = 0 // + 6
0.28571429*z = 6 // : 0.28571429
z = 6/0.28571429
z = 20.99999969
z = 20.99999969
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