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Simplifying X + (2X + 3) = 66 Reorder the terms: X + (3 + 2X) = 66 Remove parenthesis around (3 + 2X) X + 3 + 2X = 66 Reorder the terms: 3 + X + 2X = 66 Combine like terms: X + 2X = 3X 3 + 3X = 66 Solving 3 + 3X = 66 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 3X = 66 + -3 Combine like terms: 3 + -3 = 0 0 + 3X = 66 + -3 3X = 66 + -3 Combine like terms: 66 + -3 = 63 3X = 63 Divide each side by '3'. X = 21 Simplifying X = 21
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