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Simplifying -21 + -1(-13) = 0 Multiply -1 * -13 -21 + 13 = 0 Combine like terms: -21 + 13 = -8 -8 = 0 Solving -8 = 0 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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