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Simplifying 9 = 7z + -13 + -21 Reorder the terms: 9 = -13 + -21 + 7z Combine like terms: -13 + -21 = -34 9 = -34 + 7z Solving 9 = -34 + 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. 9 + -7z = -34 + 7z + -7z Combine like terms: 7z + -7z = 0 9 + -7z = -34 + 0 9 + -7z = -34 Add '-9' to each side of the equation. 9 + -9 + -7z = -34 + -9 Combine like terms: 9 + -9 = 0 0 + -7z = -34 + -9 -7z = -34 + -9 Combine like terms: -34 + -9 = -43 -7z = -43 Divide each side by '-7'. z = 6.142857143 Simplifying z = 6.142857143
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