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Simplifying 21 + -13z + -7 = 9 Reorder the terms: 21 + -7 + -13z = 9 Combine like terms: 21 + -7 = 14 14 + -13z = 9 Solving 14 + -13z = 9 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + -13z = 9 + -14 Combine like terms: 14 + -14 = 0 0 + -13z = 9 + -14 -13z = 9 + -14 Combine like terms: 9 + -14 = -5 -13z = -5 Divide each side by '-13'. z = 0.3846153846 Simplifying z = 0.3846153846
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