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Simplifying 3(7 + -1n) = -3(n + 9) (7 * 3 + -1n * 3) = -3(n + 9) (21 + -3n) = -3(n + 9) Reorder the terms: 21 + -3n = -3(9 + n) 21 + -3n = (9 * -3 + n * -3) 21 + -3n = (-27 + -3n) Add '3n' to each side of the equation. 21 + -3n + 3n = -27 + -3n + 3n Combine like terms: -3n + 3n = 0 21 + 0 = -27 + -3n + 3n 21 = -27 + -3n + 3n Combine like terms: -3n + 3n = 0 21 = -27 + 0 21 = -27 Solving 21 = -27 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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