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Simplifying 7x + -1(2x + -1) = 31 Reorder the terms: 7x + -1(-1 + 2x) = 31 7x + (-1 * -1 + 2x * -1) = 31 7x + (1 + -2x) = 31 Reorder the terms: 1 + 7x + -2x = 31 Combine like terms: 7x + -2x = 5x 1 + 5x = 31 Solving 1 + 5x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 5x = 31 + -1 Combine like terms: 1 + -1 = 0 0 + 5x = 31 + -1 5x = 31 + -1 Combine like terms: 31 + -1 = 30 5x = 30 Divide each side by '5'. x = 6 Simplifying x = 6
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