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Simplifying 9 + 2(5X + 4) = 21 Reorder the terms: 9 + 2(4 + 5X) = 21 9 + (4 * 2 + 5X * 2) = 21 9 + (8 + 10X) = 21 Combine like terms: 9 + 8 = 17 17 + 10X = 21 Solving 17 + 10X = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-17' to each side of the equation. 17 + -17 + 10X = 21 + -17 Combine like terms: 17 + -17 = 0 0 + 10X = 21 + -17 10X = 21 + -17 Combine like terms: 21 + -17 = 4 10X = 4 Divide each side by '10'. X = 0.4 Simplifying X = 0.4
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