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z in (-oo:+oo)
3*z+6*z-(23/5)-(2/5) = 4 // - 4
3*z+6*z-(23/5)-(2/5)-4 = 0
3*z+6*z-23/5-2/5-4 = 0
9*z-9 = 0 // + 9
9*z = 9 // : 9
z = 9/9
z = 1
z = 1
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