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Simplifying 9 + 2[X + -4] = 21 Reorder the terms: 9 + 2[-4 + X] = 21 9 + [-4 * 2 + X * 2] = 21 9 + [-8 + 2X] = 21 Combine like terms: 9 + -8 = 1 1 + 2X = 21 Solving 1 + 2X = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2X = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 2X = 21 + -1 2X = 21 + -1 Combine like terms: 21 + -1 = 20 2X = 20 Divide each side by '2'. X = 10 Simplifying X = 10
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