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Simplifying 3 + (7 + 2) = (3 + 7) + 2 Combine like terms: 7 + 2 = 9 3 + (9) = (3 + 7) + 2 3 + 9 = (3 + 7) + 2 Combine like terms: 3 + 9 = 12 12 = (3 + 7) + 2 Combine like terms: 3 + 7 = 10 12 = (10) + 2 12 = 10 + 2 Combine like terms: 10 + 2 = 12 12 = 12 Add '-12' to each side of the equation. 12 + -12 = 12 + -12 Combine like terms: 12 + -12 = 0 0 = 12 + -12 Combine like terms: 12 + -12 = 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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