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Simplifying 3x + 7(2x + 12) = 169 Reorder the terms: 3x + 7(12 + 2x) = 169 3x + (12 * 7 + 2x * 7) = 169 3x + (84 + 14x) = 169 Reorder the terms: 84 + 3x + 14x = 169 Combine like terms: 3x + 14x = 17x 84 + 17x = 169 Solving 84 + 17x = 169 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 17x = 169 + -84 Combine like terms: 84 + -84 = 0 0 + 17x = 169 + -84 17x = 169 + -84 Combine like terms: 169 + -84 = 85 17x = 85 Divide each side by '17'. x = 5 Simplifying x = 5
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