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Simplifying (6n + 1) + n = 90 Reorder the terms: (1 + 6n) + n = 90 Remove parenthesis around (1 + 6n) 1 + 6n + n = 90 Combine like terms: 6n + n = 7n 1 + 7n = 90 Solving 1 + 7n = 90 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 7n = 90 + -1 Combine like terms: 1 + -1 = 0 0 + 7n = 90 + -1 7n = 90 + -1 Combine like terms: 90 + -1 = 89 7n = 89 Divide each side by '7'. n = 12.71428571 Simplifying n = 12.71428571
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