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Simplifying 21 + 2.50X = 4X Solving 21 + 2.50X = 4X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-4X' to each side of the equation. 21 + 2.50X + -4X = 4X + -4X Combine like terms: 2.50X + -4X = -1.5X 21 + -1.5X = 4X + -4X Combine like terms: 4X + -4X = 0 21 + -1.5X = 0 Add '-21' to each side of the equation. 21 + -21 + -1.5X = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1.5X = 0 + -21 -1.5X = 0 + -21 Combine like terms: 0 + -21 = -21 -1.5X = -21 Divide each side by '-1.5'. X = 14 Simplifying X = 14
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