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Simplifying 18z + (-15z) + -1(-13) = 20 Multiply -1 * -13 18z + (-15z) + 13 = 20 Reorder the terms: 13 + 18z + (-15z) = 20 Combine like terms: 18z + (-15z) = 3z 13 + 3z = 20 Solving 13 + 3z = 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 + 3z = 20 + -13 Combine like terms: 13 + -13 = 0 0 + 3z = 20 + -13 3z = 20 + -13 Combine like terms: 20 + -13 = 7 3z = 7 Divide each side by '3'. z = 2.333333333 Simplifying z = 2.333333333
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