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Simplifying 3(z + 7) = 12 Reorder the terms: 3(7 + z) = 12 (7 * 3 + z * 3) = 12 (21 + 3z) = 12 Solving 21 + 3z = 12 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3z = 12 + -21 Combine like terms: 21 + -21 = 0 0 + 3z = 12 + -21 3z = 12 + -21 Combine like terms: 12 + -21 = -9 3z = -9 Divide each side by '3'. z = -3 Simplifying z = -3
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