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Simplifying -7n + -9 = 9 + -10n Reorder the terms: -9 + -7n = 9 + -10n Solving -9 + -7n = 9 + -10n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '10n' to each side of the equation. -9 + -7n + 10n = 9 + -10n + 10n Combine like terms: -7n + 10n = 3n -9 + 3n = 9 + -10n + 10n Combine like terms: -10n + 10n = 0 -9 + 3n = 9 + 0 -9 + 3n = 9 Add '9' to each side of the equation. -9 + 9 + 3n = 9 + 9 Combine like terms: -9 + 9 = 0 0 + 3n = 9 + 9 3n = 9 + 9 Combine like terms: 9 + 9 = 18 3n = 18 Divide each side by '3'. n = 6 Simplifying n = 6
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