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Simplifying 4z + 21 = 7z + -9 Reorder the terms: 21 + 4z = 7z + -9 Reorder the terms: 21 + 4z = -9 + 7z Solving 21 + 4z = -9 + 7z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-7z' to each side of the equation. 21 + 4z + -7z = -9 + 7z + -7z Combine like terms: 4z + -7z = -3z 21 + -3z = -9 + 7z + -7z Combine like terms: 7z + -7z = 0 21 + -3z = -9 + 0 21 + -3z = -9 Add '-21' to each side of the equation. 21 + -21 + -3z = -9 + -21 Combine like terms: 21 + -21 = 0 0 + -3z = -9 + -21 -3z = -9 + -21 Combine like terms: -9 + -21 = -30 -3z = -30 Divide each side by '-3'. z = 10 Simplifying z = 10
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