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z in (-oo:+oo)
-3*z-z-(-3/5) = -(3*z)-27/5 // + -(3*z)-27/5
3*z-3*z-z-(-3/5)-(-27/5) = 0
3*z-3*z-z+3/5+27/5 = 0
6-z = 0 // - 6
-z = -6 // * -1
z = 6
z = 6
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