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Simplifying 7z + -13z + -21 = 9 Reorder the terms: -21 + 7z + -13z = 9 Combine like terms: 7z + -13z = -6z -21 + -6z = 9 Solving -21 + -6z = 9 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 + -6z = 9 + 21 Combine like terms: -21 + 21 = 0 0 + -6z = 9 + 21 -6z = 9 + 21 Combine like terms: 9 + 21 = 30 -6z = 30 Divide each side by '-6'. z = -5 Simplifying z = -5
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