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z in (-oo:+oo)
4-(-z/3) = 18 // - 18
4-(-z/3)-18 = 0
(1/3)*z-18+4 = 0
1/3*z-14 = 0 // + 14
1/3*z = 14 // : 1/3
z = 14/1/3
z = 42
z = 42
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