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Simplifying 6z + -21 = z + 9 Reorder the terms: -21 + 6z = z + 9 Reorder the terms: -21 + 6z = 9 + z Solving -21 + 6z = 9 + z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. -21 + 6z + -1z = 9 + z + -1z Combine like terms: 6z + -1z = 5z -21 + 5z = 9 + z + -1z Combine like terms: z + -1z = 0 -21 + 5z = 9 + 0 -21 + 5z = 9 Add '21' to each side of the equation. -21 + 21 + 5z = 9 + 21 Combine like terms: -21 + 21 = 0 0 + 5z = 9 + 21 5z = 9 + 21 Combine like terms: 9 + 21 = 30 5z = 30 Divide each side by '5'. z = 6 Simplifying z = 6
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