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z in (-oo:+oo)
5*z-(9/3) = 7 // - 7
5*z-(9/3)-7 = 0
5*z-7-3 = 0
5*z-10 = 0 // + 10
5*z = 10 // : 5
z = 10/5
z = 2
z = 2
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