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Simplifying 3(x + 7) + 21 = 0 Reorder the terms: 3(7 + x) + 21 = 0 (7 * 3 + x * 3) + 21 = 0 (21 + 3x) + 21 = 0 Reorder the terms: 21 + 21 + 3x = 0 Combine like terms: 21 + 21 = 42 42 + 3x = 0 Solving 42 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 3x = 0 + -42 Combine like terms: 42 + -42 = 0 0 + 3x = 0 + -42 3x = 0 + -42 Combine like terms: 0 + -42 = -42 3x = -42 Divide each side by '3'. x = -14 Simplifying x = -14
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