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Simplifying 4(21) + 13 = 0 Multiply 4 * 21 84 + 13 = 0 Combine like terms: 84 + 13 = 97 97 = 0 Solving 97 = 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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