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Simplifying -13z + -2z + 13 = 20 Reorder the terms: 13 + -13z + -2z = 20 Combine like terms: -13z + -2z = -15z 13 + -15z = 20 Solving 13 + -15z = 20 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 = 20 + -13 Combine like terms: 13 + -13 = 0 0 + -15z = 20 + -13 -15z = 20 + -13 Combine like terms: 20 + -13 = 7 -15z = 7 Divide each side by '-15'. z = -0.4666666667 Simplifying z = -0.4666666667
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