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Simplifying 3x + 3(3x + 7) = 117 Reorder the terms: 3x + 3(7 + 3x) = 117 3x + (7 * 3 + 3x * 3) = 117 3x + (21 + 9x) = 117 Reorder the terms: 21 + 3x + 9x = 117 Combine like terms: 3x + 9x = 12x 21 + 12x = 117 Solving 21 + 12x = 117 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 + 12x = 117 + -21 Combine like terms: 21 + -21 = 0 0 + 12x = 117 + -21 12x = 117 + -21 Combine like terms: 117 + -21 = 96 12x = 96 Divide each side by '12'. x = 8 Simplifying x = 8
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