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Simplifying 12 + -1(-9) + -1[5 + -1(4)] = 0 Multiply -1 * -9 12 + 9 + -1[5 + -1(4)] = 0 Multiply -1 * 4 12 + 9 + -1[5 + -4] = 0 Combine like terms: 5 + -4 = 1 12 + 9 + -1[1] = 0 Multiply -1 * 1 12 + 9 + -1 = 0 Combine like terms: 12 + 9 = 21 21 + -1 = 0 Combine like terms: 21 + -1 = 20 20 = 0 Solving 20 = 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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