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Simplifying 3x + 3x + 12 = 126 Reorder the terms: 12 + 3x + 3x = 126 Combine like terms: 3x + 3x = 6x 12 + 6x = 126 Solving 12 + 6x = 126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 6x = 126 + -12 Combine like terms: 12 + -12 = 0 0 + 6x = 126 + -12 6x = 126 + -12 Combine like terms: 126 + -12 = 114 6x = 114 Divide each side by '6'. x = 19 Simplifying x = 19
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