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Simplifying 21 = 4X + -9X Combine like terms: 4X + -9X = -5X 21 = -5X Solving 21 = -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 = -5X + 5X Combine like terms: -5X + 5X = 0 21 + 5X = 0 Add '-21' to each side of the equation. 21 + -21 + 5X = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 5X = 0 + -21 5X = 0 + -21 Combine like terms: 0 + -21 = -21 5X = -21 Divide each side by '5'. X = -4.2 Simplifying X = -4.2
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