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Simplifying 231 = 7(3x + 9) Reorder the terms: 231 = 7(9 + 3x) 231 = (9 * 7 + 3x * 7) 231 = (63 + 21x) Solving 231 = 63 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 231 + -21x = 63 + 21x + -21x Combine like terms: 21x + -21x = 0 231 + -21x = 63 + 0 231 + -21x = 63 Add '-231' to each side of the equation. 231 + -231 + -21x = 63 + -231 Combine like terms: 231 + -231 = 0 0 + -21x = 63 + -231 -21x = 63 + -231 Combine like terms: 63 + -231 = -168 -21x = -168 Divide each side by '-21'. x = 8 Simplifying x = 8
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