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Simplifying 2x + x + (x + 3) = 31 Reorder the terms: 2x + x + (3 + x) = 31 Remove parenthesis around (3 + x) 2x + x + 3 + x = 31 Reorder the terms: 3 + 2x + x + x = 31 Combine like terms: 2x + x = 3x 3 + 3x + x = 31 Combine like terms: 3x + x = 4x 3 + 4x = 31 Solving 3 + 4x = 31 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 4x = 31 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 31 + -3 4x = 31 + -3 Combine like terms: 31 + -3 = 28 4x = 28 Divide each side by '4'. x = 7 Simplifying x = 7
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