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Simplifying 7(x + 3) = 126 Reorder the terms: 7(3 + x) = 126 (3 * 7 + x * 7) = 126 (21 + 7x) = 126 Solving 21 + 7x = 126 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 + 7x = 126 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = 126 + -21 7x = 126 + -21 Combine like terms: 126 + -21 = 105 7x = 105 Divide each side by '7'. x = 15 Simplifying x = 15
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