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Simplifying (17 + 4) + 9 = 17 + (4 + 9) Combine like terms: 17 + 4 = 21 (21) + 9 = 17 + (4 + 9) 21 + 9 = 17 + (4 + 9) Combine like terms: 21 + 9 = 30 30 = 17 + (4 + 9) Combine like terms: 4 + 9 = 13 30 = 17 + (13) 30 = 17 + 13 Combine like terms: 17 + 13 = 30 30 = 30 Add '-30' to each side of the equation. 30 + -30 = 30 + -30 Combine like terms: 30 + -30 = 0 0 = 30 + -30 Combine like terms: 30 + -30 = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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