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Simplifying 7n + 18 = 6n + (n + -9) Reorder the terms: 18 + 7n = 6n + (n + -9) Reorder the terms: 18 + 7n = 6n + (-9 + n) Remove parenthesis around (-9 + n) 18 + 7n = 6n + -9 + n Reorder the terms: 18 + 7n = -9 + 6n + n Combine like terms: 6n + n = 7n 18 + 7n = -9 + 7n Add '-7n' to each side of the equation. 18 + 7n + -7n = -9 + 7n + -7n Combine like terms: 7n + -7n = 0 18 + 0 = -9 + 7n + -7n 18 = -9 + 7n + -7n Combine like terms: 7n + -7n = 0 18 = -9 + 0 18 = -9 Solving 18 = -9 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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