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Simplifying 3(7n + -1) + 9 = 7(3n + 7) Reorder the terms: 3(-1 + 7n) + 9 = 7(3n + 7) (-1 * 3 + 7n * 3) + 9 = 7(3n + 7) (-3 + 21n) + 9 = 7(3n + 7) Reorder the terms: -3 + 9 + 21n = 7(3n + 7) Combine like terms: -3 + 9 = 6 6 + 21n = 7(3n + 7) Reorder the terms: 6 + 21n = 7(7 + 3n) 6 + 21n = (7 * 7 + 3n * 7) 6 + 21n = (49 + 21n) Add '-21n' to each side of the equation. 6 + 21n + -21n = 49 + 21n + -21n Combine like terms: 21n + -21n = 0 6 + 0 = 49 + 21n + -21n 6 = 49 + 21n + -21n Combine like terms: 21n + -21n = 0 6 = 49 + 0 6 = 49 Solving 6 = 49 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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