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Simplifying 9 + -1(-12) + (-13) + -4 = 0 Multiply -1 * -12 9 + 12 + (-13) + -4 = 0 9 + 12 + -13 + -4 = 0 Combine like terms: 9 + 12 = 21 21 + -13 + -4 = 0 Combine like terms: 21 + -13 = 8 8 + -4 = 0 Combine like terms: 8 + -4 = 4 4 = 0 Solving 4 = 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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