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Simplifying 7n + -1(3n + 1) = 4(3 + n) Reorder the terms: 7n + -1(1 + 3n) = 4(3 + n) 7n + (1 * -1 + 3n * -1) = 4(3 + n) 7n + (-1 + -3n) = 4(3 + n) Reorder the terms: -1 + 7n + -3n = 4(3 + n) Combine like terms: 7n + -3n = 4n -1 + 4n = 4(3 + n) -1 + 4n = (3 * 4 + n * 4) -1 + 4n = (12 + 4n) Add '-4n' to each side of the equation. -1 + 4n + -4n = 12 + 4n + -4n Combine like terms: 4n + -4n = 0 -1 + 0 = 12 + 4n + -4n -1 = 12 + 4n + -4n Combine like terms: 4n + -4n = 0 -1 = 12 + 0 -1 = 12 Solving -1 = 12 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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