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Simplifying (4n) = (n + 90) Reorder the terms: (4n) = (90 + n) Remove parenthesis around (90 + n) (4n) = 90 + n Solving (4n) = 90 + n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. (4n) + -1n = 90 + n + -1n Combine like terms: (4n) + -1n = 3n 3n = 90 + n + -1n Combine like terms: n + -1n = 0 3n = 90 + 0 3n = 90 Divide each side by '3'. n = 30 Simplifying n = 30
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