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Simplifying 7(3x + 6) = 126 Reorder the terms: 7(6 + 3x) = 126 (6 * 7 + 3x * 7) = 126 (42 + 21x) = 126 Solving 42 + 21x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 21x = 126 + -42 Combine like terms: 42 + -42 = 0 0 + 21x = 126 + -42 21x = 126 + -42 Combine like terms: 126 + -42 = 84 21x = 84 Divide each side by '21'. x = 4 Simplifying x = 4
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