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Simplifying 12x = 5x + 21 Reorder the terms: 12x = 21 + 5x Solving 12x = 21 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 12x + -5x = 21 + 5x + -5x Combine like terms: 12x + -5x = 7x 7x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 7x = 21 + 0 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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