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Simplifying -1(-1z) = z Remove parenthesis around (-1z) -1 * -1z = z Multiply -1 * -1 1z = z Solving 1z = z Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1z' to each side of the equation. 1z + -1z = z + -1z Combine like terms: 1z + -1z = 0 0 = z + -1z Combine like terms: z + -1z = 0 0 = 0 Simplifying 0 = 0 The solution to this equation could not be determined.
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