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Simplifying 2x + 7(3 + x) = 0 2x + (3 * 7 + x * 7) = 0 2x + (21 + 7x) = 0 Reorder the terms: 21 + 2x + 7x = 0 Combine like terms: 2x + 7x = 9x 21 + 9x = 0 Solving 21 + 9x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 9x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 9x = 0 + -21 9x = 0 + -21 Combine like terms: 0 + -21 = -21 9x = -21 Divide each side by '9'. x = -2.333333333 Simplifying x = -2.333333333
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