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Simplifying 3 + 2x + 3 + 2x + x + x = 78 Reorder the terms: 3 + 3 + 2x + 2x + x + x = 78 Combine like terms: 3 + 3 = 6 6 + 2x + 2x + x + x = 78 Combine like terms: 2x + 2x = 4x 6 + 4x + x + x = 78 Combine like terms: 4x + x = 5x 6 + 5x + x = 78 Combine like terms: 5x + x = 6x 6 + 6x = 78 Solving 6 + 6x = 78 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 6x = 78 + -6 Combine like terms: 6 + -6 = 0 0 + 6x = 78 + -6 6x = 78 + -6 Combine like terms: 78 + -6 = 72 6x = 72 Divide each side by '6'. x = 12 Simplifying x = 12
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