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Simplifying 4 + 2 + 2 = 21 + -2z Combine like terms: 4 + 2 = 6 6 + 2 = 21 + -2z Combine like terms: 6 + 2 = 8 8 = 21 + -2z Solving 8 = 21 + -2z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '2z' to each side of the equation. 8 + 2z = 21 + -2z + 2z Combine like terms: -2z + 2z = 0 8 + 2z = 21 + 0 8 + 2z = 21 Add '-8' to each side of the equation. 8 + -8 + 2z = 21 + -8 Combine like terms: 8 + -8 = 0 0 + 2z = 21 + -8 2z = 21 + -8 Combine like terms: 21 + -8 = 13 2z = 13 Divide each side by '2'. z = 6.5 Simplifying z = 6.5
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