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Simplifying 12x + -21 = 7x + 39 Reorder the terms: -21 + 12x = 7x + 39 Reorder the terms: -21 + 12x = 39 + 7x Solving -21 + 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. -21 + 12x + -7x = 39 + 7x + -7x Combine like terms: 12x + -7x = 5x -21 + 5x = 39 + 7x + -7x Combine like terms: 7x + -7x = 0 -21 + 5x = 39 + 0 -21 + 5x = 39 Add '21' to each side of the equation. -21 + 21 + 5x = 39 + 21 Combine like terms: -21 + 21 = 0 0 + 5x = 39 + 21 5x = 39 + 21 Combine like terms: 39 + 21 = 60 5x = 60 Divide each side by '5'. x = 12 Simplifying x = 12
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