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Simplifying 7x + 9 + -5x = 31 Reorder the terms: 9 + 7x + -5x = 31 Combine like terms: 7x + -5x = 2x 9 + 2x = 31 Solving 9 + 2x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 2x = 31 + -9 Combine like terms: 9 + -9 = 0 0 + 2x = 31 + -9 2x = 31 + -9 Combine like terms: 31 + -9 = 22 2x = 22 Divide each side by '2'. x = 11 Simplifying x = 11
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