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Simplifying 3X + 3 = X + 21 Reorder the terms: 3 + 3X = X + 21 Reorder the terms: 3 + 3X = 21 + X Solving 3 + 3X = 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. 3 + 3X + -1X = 21 + X + -1X Combine like terms: 3X + -1X = 2X 3 + 2X = 21 + X + -1X Combine like terms: X + -1X = 0 3 + 2X = 21 + 0 3 + 2X = 21 Add '-3' to each side of the equation. 3 + -3 + 2X = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2X = 21 + -3 2X = 21 + -3 Combine like terms: 21 + -3 = 18 2X = 18 Divide each side by '2'. X = 9 Simplifying X = 9
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