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Simplifying -2z + -1(-9) = 13 Multiply -1 * -9 -2z + 9 = 13 Reorder the terms: 9 + -2z = 13 Solving 9 + -2z = 13 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -2z = 13 + -9 Combine like terms: 9 + -9 = 0 0 + -2z = 13 + -9 -2z = 13 + -9 Combine like terms: 13 + -9 = 4 -2z = 4 Divide each side by '-2'. z = -2 Simplifying z = -2
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