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Simplifying 7x + -1(2x + 9) = 31 Reorder the terms: 7x + -1(9 + 2x) = 31 7x + (9 * -1 + 2x * -1) = 31 7x + (-9 + -2x) = 31 Reorder the terms: -9 + 7x + -2x = 31 Combine like terms: 7x + -2x = 5x -9 + 5x = 31 Solving -9 + 5x = 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 + 5x = 31 + 9 Combine like terms: -9 + 9 = 0 0 + 5x = 31 + 9 5x = 31 + 9 Combine like terms: 31 + 9 = 40 5x = 40 Divide each side by '5'. x = 8 Simplifying x = 8
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