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Simplifying 21 + -1[-1(3 + -4) + -2] + -5 = 0 Combine like terms: 3 + -4 = -1 21 + -1[-1(-1) + -2] + -5 = 0 Multiply -1 * -1 21 + -1[1 + -2] + -5 = 0 Combine like terms: 1 + -2 = -1 21 + -1[-1] + -5 = 0 Multiply -1 * -1 21 + 1 + -5 = 0 Combine like terms: 21 + 1 = 22 22 + -5 = 0 Combine like terms: 22 + -5 = 17 17 = 0 Solving 17 = 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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