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Simplifying 7(3x + 3) = 168 Reorder the terms: 7(3 + 3x) = 168 (3 * 7 + 3x * 7) = 168 (21 + 21x) = 168 Solving 21 + 21x = 168 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 = 168 + -21 Combine like terms: 21 + -21 = 0 0 + 21x = 168 + -21 21x = 168 + -21 Combine like terms: 168 + -21 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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