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Simplifying -21 = z + 2 Reorder the terms: -21 = 2 + z Solving -21 = 2 + 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 + -1z = 2 + z + -1z Combine like terms: z + -1z = 0 -21 + -1z = 2 + 0 -21 + -1z = 2 Add '21' to each side of the equation. -21 + 21 + -1z = 2 + 21 Combine like terms: -21 + 21 = 0 0 + -1z = 2 + 21 -1z = 2 + 21 Combine like terms: 2 + 21 = 23 -1z = 23 Divide each side by '-1'. z = -23 Simplifying z = -23
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