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Simplifying (n + 40) + 90 = n Reorder the terms: (40 + n) + 90 = n Remove parenthesis around (40 + n) 40 + n + 90 = n Reorder the terms: 40 + 90 + n = n Combine like terms: 40 + 90 = 130 130 + n = n Add '-1n' to each side of the equation. 130 + n + -1n = n + -1n Combine like terms: n + -1n = 0 130 + 0 = n + -1n 130 = n + -1n Combine like terms: n + -1n = 0 130 = 0 Solving 130 = 0 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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