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Simplifying 10n + -9 = 7n + 12 Reorder the terms: -9 + 10n = 7n + 12 Reorder the terms: -9 + 10n = 12 + 7n Solving -9 + 10n = 12 + 7n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7n' to each side of the equation. -9 + 10n + -7n = 12 + 7n + -7n Combine like terms: 10n + -7n = 3n -9 + 3n = 12 + 7n + -7n Combine like terms: 7n + -7n = 0 -9 + 3n = 12 + 0 -9 + 3n = 12 Add '9' to each side of the equation. -9 + 9 + 3n = 12 + 9 Combine like terms: -9 + 9 = 0 0 + 3n = 12 + 9 3n = 12 + 9 Combine like terms: 12 + 9 = 21 3n = 21 Divide each side by '3'. n = 7 Simplifying n = 7
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