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z in (-oo:+oo)
z/3 = 1.8 // - 1.8
z/3-1.8 = 0
1/3*z-1.8 = 0 // + 1.8
1/3*z = 1.8 // : 1/3
z = 1.8/1/3
z = 5.40000005
z = 5.40000005
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