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Simplifying -4[9 + 4(-4 + 4)] + 13 = 0 Combine like terms: -4 + 4 = 0 -4[9 + 4(0)] + 13 = 0 Multiply 4 * 0 -4[9 + 0] + 13 = 0 Anything times zero is zero. -4[9 + 0] + 13 = 0 Combine like terms: 9 + 0 = 9 -4[9] + 13 = 0 Multiply -4 * 9 -36 + 13 = 0 Combine like terms: -36 + 13 = -23 -23 = 0 Solving -23 = 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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