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Simplifying 7x + -9 = 5x + 21 Reorder the terms: -9 + 7x = 5x + 21 Reorder the terms: -9 + 7x = 21 + 5x Solving -9 + 7x = 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. -9 + 7x + -5x = 21 + 5x + -5x Combine like terms: 7x + -5x = 2x -9 + 2x = 21 + 5x + -5x Combine like terms: 5x + -5x = 0 -9 + 2x = 21 + 0 -9 + 2x = 21 Add '9' to each side of the equation. -9 + 9 + 2x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + 2x = 21 + 9 2x = 21 + 9 Combine like terms: 21 + 9 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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