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Simplifying 7(6x + 3) = 399 Reorder the terms: 7(3 + 6x) = 399 (3 * 7 + 6x * 7) = 399 (21 + 42x) = 399 Solving 21 + 42x = 399 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 + 42x = 399 + -21 Combine like terms: 21 + -21 = 0 0 + 42x = 399 + -21 42x = 399 + -21 Combine like terms: 399 + -21 = 378 42x = 378 Divide each side by '42'. x = 9 Simplifying x = 9
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