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Simplifying 3(1 + X) = 15 + X (1 * 3 + X * 3) = 15 + X (3 + 3X) = 15 + X Solving 3 + 3X = 15 + 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 = 15 + X + -1X Combine like terms: 3X + -1X = 2X 3 + 2X = 15 + X + -1X Combine like terms: X + -1X = 0 3 + 2X = 15 + 0 3 + 2X = 15 Add '-3' to each side of the equation. 3 + -3 + 2X = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 2X = 15 + -3 2X = 15 + -3 Combine like terms: 15 + -3 = 12 2X = 12 Divide each side by '2'. X = 6 Simplifying X = 6
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