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Simplifying 7z + -9z + -13 = -1 Reorder the terms: -13 + 7z + -9z = -1 Combine like terms: 7z + -9z = -2z -13 + -2z = -1 Solving -13 + -2z = -1 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 + -2z = -1 + 13 Combine like terms: -13 + 13 = 0 0 + -2z = -1 + 13 -2z = -1 + 13 Combine like terms: -1 + 13 = 12 -2z = 12 Divide each side by '-2'. z = -6 Simplifying z = -6
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