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Simplifying 6k + 18 = 6k + -21 Reorder the terms: 18 + 6k = 6k + -21 Reorder the terms: 18 + 6k = -21 + 6k Add '-6k' to each side of the equation. 18 + 6k + -6k = -21 + 6k + -6k Combine like terms: 6k + -6k = 0 18 + 0 = -21 + 6k + -6k 18 = -21 + 6k + -6k Combine like terms: 6k + -6k = 0 18 = -21 + 0 18 = -21 Solving 18 = -21 Couldn't find a variable to solve for. This equation is invalid, the left and right sides are not equal, therefore there is no solution.
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