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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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