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Simplifying 31 = 25 + -2(x + 7) Reorder the terms: 31 = 25 + -2(7 + x) 31 = 25 + (7 * -2 + x * -2) 31 = 25 + (-14 + -2x) Combine like terms: 25 + -14 = 11 31 = 11 + -2x Solving 31 = 11 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 31 + 2x = 11 + -2x + 2x Combine like terms: -2x + 2x = 0 31 + 2x = 11 + 0 31 + 2x = 11 Add '-31' to each side of the equation. 31 + -31 + 2x = 11 + -31 Combine like terms: 31 + -31 = 0 0 + 2x = 11 + -31 2x = 11 + -31 Combine like terms: 11 + -31 = -20 2x = -20 Divide each side by '2'. x = -10 Simplifying x = -10
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