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Simplifying 7[3x + 3] = 126 Reorder the terms: 7[3 + 3x] = 126 [3 * 7 + 3x * 7] = 126 [21 + 21x] = 126 Solving 21 + 21x = 126 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 + 21x = 126 + -21 Combine like terms: 21 + -21 = 0 0 + 21x = 126 + -21 21x = 126 + -21 Combine like terms: 126 + -21 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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