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Simplifying 21 + -7n = -7(n + -1) Reorder the terms: 21 + -7n = -7(-1 + n) 21 + -7n = (-1 * -7 + n * -7) 21 + -7n = (7 + -7n) Add '7n' to each side of the equation. 21 + -7n + 7n = 7 + -7n + 7n Combine like terms: -7n + 7n = 0 21 + 0 = 7 + -7n + 7n 21 = 7 + -7n + 7n Combine like terms: -7n + 7n = 0 21 = 7 + 0 21 = 7 Solving 21 = 7 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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