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z in (-oo:+oo)
3/5 = z/3.5 // - z/3.5
3/5-(z/3.5) = 0
3/5-0.28571429*z = 0
3/5-0.28571429*z = 0 // - 3/5
-0.28571429*z = -3/5 // : -0.28571429
z = -3/5/(-0.28571429)
z = 2.09999997
z = 2.09999997
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