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Simplifying 2x + 3(4 + x) = 72 2x + (4 * 3 + x * 3) = 72 2x + (12 + 3x) = 72 Reorder the terms: 12 + 2x + 3x = 72 Combine like terms: 2x + 3x = 5x 12 + 5x = 72 Solving 12 + 5x = 72 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 + 5x = 72 + -12 Combine like terms: 12 + -12 = 0 0 + 5x = 72 + -12 5x = 72 + -12 Combine like terms: 72 + -12 = 60 5x = 60 Divide each side by '5'. x = 12 Simplifying x = 12
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