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Simplifying -21(z + -991) = -42 Reorder the terms: -21(-991 + z) = -42 (-991 * -21 + z * -21) = -42 (20811 + -21z) = -42 Solving 20811 + -21z = -42 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-20811' to each side of the equation. 20811 + -20811 + -21z = -42 + -20811 Combine like terms: 20811 + -20811 = 0 0 + -21z = -42 + -20811 -21z = -42 + -20811 Combine like terms: -42 + -20811 = -20853 -21z = -20853 Divide each side by '-21'. z = 993 Simplifying z = 993
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