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Simplifying 3n = n + 7 + 9n Reorder the terms: 3n = 7 + n + 9n Combine like terms: n + 9n = 10n 3n = 7 + 10n Solving 3n = 7 + 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. 3n + -10n = 7 + 10n + -10n Combine like terms: 3n + -10n = -7n -7n = 7 + 10n + -10n Combine like terms: 10n + -10n = 0 -7n = 7 + 0 -7n = 7 Divide each side by '-7'. n = -1 Simplifying n = -1
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