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z in (-oo:+oo)
9 = 28-z/3 // - 28-z/3
9-(-z/3)-28 = 0
(1/3)*z-28+9 = 0
1/3*z-19 = 0 // + 19
1/3*z = 19 // : 1/3
z = 19/1/3
z = 57
z = 57
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