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Simplifying 7x + -5 + -5x = 15 Reorder the terms: -5 + 7x + -5x = 15 Combine like terms: 7x + -5x = 2x -5 + 2x = 15 Solving -5 + 2x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 2x = 15 + 5 Combine like terms: -5 + 5 = 0 0 + 2x = 15 + 5 2x = 15 + 5 Combine like terms: 15 + 5 = 20 2x = 20 Divide each side by '2'. x = 10 Simplifying x = 10

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