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Simplifying 6(7 + 9x) + -21 = 129 (7 * 6 + 9x * 6) + -21 = 129 (42 + 54x) + -21 = 129 Reorder the terms: 42 + -21 + 54x = 129 Combine like terms: 42 + -21 = 21 21 + 54x = 129 Solving 21 + 54x = 129 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 + 54x = 129 + -21 Combine like terms: 21 + -21 = 0 0 + 54x = 129 + -21 54x = 129 + -21 Combine like terms: 129 + -21 = 108 54x = 108 Divide each side by '54'. x = 2 Simplifying x = 2
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