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Simplifying 21z + -6z + 13 = 0 Reorder the terms: 13 + 21z + -6z = 0 Combine like terms: 21z + -6z = 15z 13 + 15z = 0 Solving 13 + 15z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 15z = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 15z = 0 + -13 15z = 0 + -13 Combine like terms: 0 + -13 = -13 15z = -13 Divide each side by '15'. z = -0.8666666667 Simplifying z = -0.8666666667
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