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Simplifying 6k + 21 = 3(2k + 9) + -6 Reorder the terms: 21 + 6k = 3(2k + 9) + -6 Reorder the terms: 21 + 6k = 3(9 + 2k) + -6 21 + 6k = (9 * 3 + 2k * 3) + -6 21 + 6k = (27 + 6k) + -6 Reorder the terms: 21 + 6k = 27 + -6 + 6k Combine like terms: 27 + -6 = 21 21 + 6k = 21 + 6k Add '-21' to each side of the equation. 21 + -21 + 6k = 21 + -21 + 6k Combine like terms: 21 + -21 = 0 0 + 6k = 21 + -21 + 6k 6k = 21 + -21 + 6k Combine like terms: 21 + -21 = 0 6k = 0 + 6k 6k = 6k Add '-6k' to each side of the equation. 6k + -6k = 6k + -6k Combine like terms: 6k + -6k = 0 0 = 6k + -6k Combine like terms: 6k + -6k = 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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