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Simplifying 3[x + 7] = 9 Reorder the terms: 3[7 + x] = 9 [7 * 3 + x * 3] = 9 [21 + 3x] = 9 Solving 21 + 3x = 9 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 + 3x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 9 + -21 3x = 9 + -21 Combine like terms: 9 + -21 = -12 3x = -12 Divide each side by '3'. x = -4 Simplifying x = -4
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