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Simplifying x + 2x + (x + 4) = 76 Reorder the terms: x + 2x + (4 + x) = 76 Remove parenthesis around (4 + x) x + 2x + 4 + x = 76 Reorder the terms: 4 + x + 2x + x = 76 Combine like terms: x + 2x = 3x 4 + 3x + x = 76 Combine like terms: 3x + x = 4x 4 + 4x = 76 Solving 4 + 4x = 76 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 4x = 76 + -4 Combine like terms: 4 + -4 = 0 0 + 4x = 76 + -4 4x = 76 + -4 Combine like terms: 76 + -4 = 72 4x = 72 Divide each side by '4'. x = 18 Simplifying x = 18
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