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Simplifying 9 = 7z + -14z + -21 Reorder the terms: 9 = -21 + 7z + -14z Combine like terms: 7z + -14z = -7z 9 = -21 + -7z Solving 9 = -21 + -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 = -21 + -7z + 7z Combine like terms: -7z + 7z = 0 9 + 7z = -21 + 0 9 + 7z = -21 Add '-9' to each side of the equation. 9 + -9 + 7z = -21 + -9 Combine like terms: 9 + -9 = 0 0 + 7z = -21 + -9 7z = -21 + -9 Combine like terms: -21 + -9 = -30 7z = -30 Divide each side by '7'. z = -4.285714286 Simplifying z = -4.285714286
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