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Simplifying x + (x + 3) = 21 Reorder the terms: x + (3 + x) = 21 Remove parenthesis around (3 + x) x + 3 + x = 21 Reorder the terms: 3 + x + x = 21 Combine like terms: x + x = 2x 3 + 2x = 21 Solving 3 + 2x = 21 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 + 2x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2x = 21 + -3 2x = 21 + -3 Combine like terms: 21 + -3 = 18 2x = 18 Divide each side by '2'. x = 9 Simplifying x = 9
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