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Simplifying 13 + -1(-20) = 0 Multiply -1 * -20 13 + 20 = 0 Combine like terms: 13 + 20 = 33 33 = 0 Solving 33 = 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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