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Simplifying (x + 3) + -2 = 21 Reorder the terms: (3 + x) + -2 = 21 Remove parenthesis around (3 + x) 3 + x + -2 = 21 Reorder the terms: 3 + -2 + x = 21 Combine like terms: 3 + -2 = 1 1 + x = 21 Solving 1 + x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + x = 21 + -1 x = 21 + -1 Combine like terms: 21 + -1 = 20 x = 20 Simplifying x = 20
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