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Simplifying 12x + 9 = 7x + 39 Reorder the terms: 9 + 12x = 7x + 39 Reorder the terms: 9 + 12x = 39 + 7x Solving 9 + 12x = 39 + 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. 9 + 12x + -7x = 39 + 7x + -7x Combine like terms: 12x + -7x = 5x 9 + 5x = 39 + 7x + -7x Combine like terms: 7x + -7x = 0 9 + 5x = 39 + 0 9 + 5x = 39 Add '-9' to each side of the equation. 9 + -9 + 5x = 39 + -9 Combine like terms: 9 + -9 = 0 0 + 5x = 39 + -9 5x = 39 + -9 Combine like terms: 39 + -9 = 30 5x = 30 Divide each side by '5'. x = 6 Simplifying x = 6
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