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Simplifying 3x = [x + 30] Reorder the terms: 3x = [30 + x] Remove brackets around [30 + x] 3x = 30 + x Solving 3x = 30 + 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. 3x + -1x = 30 + x + -1x Combine like terms: 3x + -1x = 2x 2x = 30 + x + -1x Combine like terms: x + -1x = 0 2x = 30 + 0 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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