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