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Simplifying 3x + 9(x + 7) = 0 Reorder the terms: 3x + 9(7 + x) = 0 3x + (7 * 9 + x * 9) = 0 3x + (63 + 9x) = 0 Reorder the terms: 63 + 3x + 9x = 0 Combine like terms: 3x + 9x = 12x 63 + 12x = 0 Solving 63 + 12x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + 12x = 0 + -63 Combine like terms: 63 + -63 = 0 0 + 12x = 0 + -63 12x = 0 + -63 Combine like terms: 0 + -63 = -63 12x = -63 Divide each side by '12'. x = -5.25 Simplifying x = -5.25
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