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Simplifying -3(2k + -2) + 7 = 21 + -6k Reorder the terms: -3(-2 + 2k) + 7 = 21 + -6k (-2 * -3 + 2k * -3) + 7 = 21 + -6k (6 + -6k) + 7 = 21 + -6k Reorder the terms: 6 + 7 + -6k = 21 + -6k Combine like terms: 6 + 7 = 13 13 + -6k = 21 + -6k Add '6k' to each side of the equation. 13 + -6k + 6k = 21 + -6k + 6k Combine like terms: -6k + 6k = 0 13 + 0 = 21 + -6k + 6k 13 = 21 + -6k + 6k Combine like terms: -6k + 6k = 0 13 = 21 + 0 13 = 21 Solving 13 = 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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