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z in (-oo:+oo)
z/3-1.8 = 1.64 // - 1.64
z/3-1.8-1.64 = 0
1/3*z-3.44 = 0 // + 3.44
1/3*z = 3.44 // : 1/3
z = 3.44/1/3
z = 10.3200001
z = 10.3200001
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