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Simplifying (x + 5) + (x + 6) + (x + 7) = n Reorder the terms: (5 + x) + (x + 6) + (x + 7) = n Remove parenthesis around (5 + x) 5 + x + (x + 6) + (x + 7) = n Reorder the terms: 5 + x + (6 + x) + (x + 7) = n Remove parenthesis around (6 + x) 5 + x + 6 + x + (x + 7) = n Reorder the terms: 5 + x + 6 + x + (7 + x) = n Remove parenthesis around (7 + x) 5 + x + 6 + x + 7 + x = n Reorder the terms: 5 + 6 + 7 + x + x + x = n Combine like terms: 5 + 6 = 11 11 + 7 + x + x + x = n Combine like terms: 11 + 7 = 18 18 + x + x + x = n Combine like terms: x + x = 2x 18 + 2x + x = n Combine like terms: 2x + x = 3x 18 + 3x = n Solving 18 + 3x = n Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 3x = -18 + n Combine like terms: 18 + -18 = 0 0 + 3x = -18 + n 3x = -18 + n Divide each side by '3'. x = -6 + 0.3333333333n Simplifying x = -6 + 0.3333333333n
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