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Simplifying 21 + 3x = 3x + X Reorder the terms: 21 + 3x = X + 3x Add '-3x' to each side of the equation. 21 + 3x + -3x = X + 3x + -3x Combine like terms: 3x + -3x = 0 21 + 0 = X + 3x + -3x 21 = X + 3x + -3x Combine like terms: 3x + -3x = 0 21 = X + 0 21 = X Solving 21 = X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-1X' to each side of the equation. 21 + -1X = X + -1X Combine like terms: X + -1X = 0 21 + -1X = 0 Add '-21' to each side of the equation. 21 + -21 + -1X = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1X = 0 + -21 -1X = 0 + -21 Combine like terms: 0 + -21 = -21 -1X = -21 Divide each side by '-1'. X = 21 Simplifying X = 21
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