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Simplifying 12x + 9 = 7x + 9 Reorder the terms: 9 + 12x = 7x + 9 Reorder the terms: 9 + 12x = 9 + 7x Add '-9' to each side of the equation. 9 + -9 + 12x = 9 + -9 + 7x Combine like terms: 9 + -9 = 0 0 + 12x = 9 + -9 + 7x 12x = 9 + -9 + 7x Combine like terms: 9 + -9 = 0 12x = 0 + 7x 12x = 7x Solving 12x = 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 12x + -7x = 7x + -7x Combine like terms: 12x + -7x = 5x 5x = 7x + -7x Combine like terms: 7x + -7x = 0 5x = 0 Divide each side by '5'. x = 0 Simplifying x = 0
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