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Simplifying 21 = 9X + 1 + -4X Reorder the terms: 21 = 1 + 9X + -4X Combine like terms: 9X + -4X = 5X 21 = 1 + 5X Solving 21 = 1 + 5X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-5X' to each side of the equation. 21 + -5X = 1 + 5X + -5X Combine like terms: 5X + -5X = 0 21 + -5X = 1 + 0 21 + -5X = 1 Add '-21' to each side of the equation. 21 + -21 + -5X = 1 + -21 Combine like terms: 21 + -21 = 0 0 + -5X = 1 + -21 -5X = 1 + -21 Combine like terms: 1 + -21 = -20 -5X = -20 Divide each side by '-5'. X = 4 Simplifying X = 4
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