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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 = -33 3z = -33 Divide each side by '3'. z = -11 Simplifying z = -11
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