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Simplifying 5z + 21 + -12z = 63 Reorder the terms: 21 + 5z + -12z = 63 Combine like terms: 5z + -12z = -7z 21 + -7z = 63 Solving 21 + -7z = 63 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -7z = 63 + -21 Combine like terms: 21 + -21 = 0 0 + -7z = 63 + -21 -7z = 63 + -21 Combine like terms: 63 + -21 = 42 -7z = 42 Divide each side by '-7'. z = -6 Simplifying z = -6
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