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Simplifying z + -13 = -31 Reorder the terms: -13 + z = -31 Solving -13 + z = -31 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 + z = -31 + 13 Combine like terms: -13 + 13 = 0 0 + z = -31 + 13 z = -31 + 13 Combine like terms: -31 + 13 = -18 z = -18 Simplifying z = -18
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