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Simplifying X + X + 3 + X + 3 = 21 Reorder the terms: 3 + 3 + X + X + X = 21 Combine like terms: 3 + 3 = 6 6 + X + X + X = 21 Combine like terms: X + X = 2X 6 + 2X + X = 21 Combine like terms: 2X + X = 3X 6 + 3X = 21 Solving 6 + 3X = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 3X = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 3X = 21 + -6 3X = 21 + -6 Combine like terms: 21 + -6 = 15 3X = 15 Divide each side by '3'. X = 5 Simplifying X = 5
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