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Simplifying 3z + -21 = z Reorder the terms: -21 + 3z = z Solving -21 + 3z = 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 + 3z + -1z = z + -1z Combine like terms: 3z + -1z = 2z -21 + 2z = z + -1z Combine like terms: z + -1z = 0 -21 + 2z = 0 Add '21' to each side of the equation. -21 + 21 + 2z = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 2z = 0 + 21 2z = 0 + 21 Combine like terms: 0 + 21 = 21 2z = 21 Divide each side by '2'. z = 10.5 Simplifying z = 10.5
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