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Simplifying -13z + -1(-15z) + 2 = 20 Remove parenthesis around (-15z) -13z + -1 * -15z + 2 = 20 Multiply -1 * -15 -13z + 15z + 2 = 20 Reorder the terms: 2 + -13z + 15z = 20 Combine like terms: -13z + 15z = 2z 2 + 2z = 20 Solving 2 + 2z = 20 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 2z = 20 + -2 Combine like terms: 2 + -2 = 0 0 + 2z = 20 + -2 2z = 20 + -2 Combine like terms: 20 + -2 = 18 2z = 18 Divide each side by '2'. z = 9 Simplifying z = 9
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