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z in (-oo:+oo)
3*z-(2/5) = 7 // - 7
3*z-(2/5)-7 = 0
3*z-2/5-7 = 0
3*z-37/5 = 0 // + 37/5
3*z = 37/5 // : 3
z = 37/5/3
z = 37/15
z = 37/15
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