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Simplifying 3(x + 3) = x + 7 Reorder the terms: 3(3 + x) = x + 7 (3 * 3 + x * 3) = x + 7 (9 + 3x) = x + 7 Reorder the terms: 9 + 3x = 7 + x Solving 9 + 3x = 7 + 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. 9 + 3x + -1x = 7 + x + -1x Combine like terms: 3x + -1x = 2x 9 + 2x = 7 + x + -1x Combine like terms: x + -1x = 0 9 + 2x = 7 + 0 9 + 2x = 7 Add '-9' to each side of the equation. 9 + -9 + 2x = 7 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 7 + -9 2x = 7 + -9 Combine like terms: 7 + -9 = -2 2x = -2 Divide each side by '2'. x = -1 Simplifying x = -1
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