-> SOLUTION: 1/2(6-z)=z
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Algebra: Expressions involving variables, substitution
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1/2(6-z) = z
(6 - z)/2 = z
2 * (6 - z)/2 = 2 * z
6 - z = 2z
6 = 2z + z
6 = 3z
6/3 = z
2 = z