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Simplifying 7n + (90 + -1n) = 210 Remove parenthesis around (90 + -1n) 7n + 90 + -1n = 210 Reorder the terms: 90 + 7n + -1n = 210 Combine like terms: 7n + -1n = 6n 90 + 6n = 210 Solving 90 + 6n = 210 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 6n = 210 + -90 Combine like terms: 90 + -90 = 0 0 + 6n = 210 + -90 6n = 210 + -90 Combine like terms: 210 + -90 = 120 6n = 120 Divide each side by '6'. n = 20 Simplifying n = 20
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