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Simplifying 63 = 2k + (21 + -1k) + 21 + (21 + -1k) Remove parenthesis around (21 + -1k) 63 = 2k + 21 + -1k + 21 + (21 + -1k) Remove parenthesis around (21 + -1k) 63 = 2k + 21 + -1k + 21 + 21 + -1k Reorder the terms: 63 = 21 + 21 + 21 + 2k + -1k + -1k Combine like terms: 21 + 21 = 42 63 = 42 + 21 + 2k + -1k + -1k Combine like terms: 42 + 21 = 63 63 = 63 + 2k + -1k + -1k Combine like terms: 2k + -1k = 1k 63 = 63 + 1k + -1k Combine like terms: 1k + -1k = 0 63 = 63 + 0 63 = 63 Add '-63' to each side of the equation. 63 + -63 = 63 + -63 Combine like terms: 63 + -63 = 0 0 = 63 + -63 Combine like terms: 63 + -63 = 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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