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Simplifying 2 + (12 + r) = (2 + 12) + r Remove parenthesis around (12 + r) 2 + 12 + r = (2 + 12) + r Combine like terms: 2 + 12 = 14 14 + r = (2 + 12) + r Combine like terms: 2 + 12 = 14 14 + r = (14) + r 14 + r = 14 + r Add '-14' to each side of the equation. 14 + -14 + r = 14 + -14 + r Combine like terms: 14 + -14 = 0 0 + r = 14 + -14 + r r = 14 + -14 + r Combine like terms: 14 + -14 = 0 r = 0 + r r = r Add '-1r' to each side of the equation. r + -1r = r + -1r Combine like terms: r + -1r = 0 0 = r + -1r Combine like terms: r + -1r = 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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