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Simplifying 7x + 9 + 6x = 126 Reorder the terms: 9 + 7x + 6x = 126 Combine like terms: 7x + 6x = 13x 9 + 13x = 126 Solving 9 + 13x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 13x = 126 + -9 Combine like terms: 9 + -9 = 0 0 + 13x = 126 + -9 13x = 126 + -9 Combine like terms: 126 + -9 = 117 13x = 117 Divide each side by '13'. x = 9 Simplifying x = 9
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