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Simplifying 9x + 2(3x + 7) = -31 Reorder the terms: 9x + 2(7 + 3x) = -31 9x + (7 * 2 + 3x * 2) = -31 9x + (14 + 6x) = -31 Reorder the terms: 14 + 9x + 6x = -31 Combine like terms: 9x + 6x = 15x 14 + 15x = -31 Solving 14 + 15x = -31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 15x = -31 + -14 Combine like terms: 14 + -14 = 0 0 + 15x = -31 + -14 15x = -31 + -14 Combine like terms: -31 + -14 = -45 15x = -45 Divide each side by '15'. x = -3 Simplifying x = -3
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