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z in (-oo:+oo)
5.8 = z/2.2 // - z/2.2
5.8-(z/2.2) = 0
5.8-0.45454545*z = 0
5.8-0.45454545*z = 0 // - 5.8
-0.45454545*z = -5.8 // : -0.45454545
z = -5.8/(-0.45454545)
z = 12.76000013
z = 12.76000013
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