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Simplifying k + (k + 0) + (k + k) = 4k Reorder the terms: k + (0 + k) + (k + k) = 4k Remove the zero: k + (k) + (k + k) = 4k k + k + (k + k) = 4k Combine like terms: k + k = 2k k + k + (2k) = 4k k + k + (2k) = 4k Combine like terms: k + k = 2k 2k + (2k) = 4k Combine like terms: 2k + (2k) = 4k 4k = 4k Add '-4k' to each side of the equation. 4k + -4k = 4k + -4k Combine like terms: 4k + -4k = 0 0 = 4k + -4k Combine like terms: 4k + -4k = 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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