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Simplifying 9n + 15 = 5n + 7n Reorder the terms: 15 + 9n = 5n + 7n Combine like terms: 5n + 7n = 12n 15 + 9n = 12n Solving 15 + 9n = 12n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12n' to each side of the equation. 15 + 9n + -12n = 12n + -12n Combine like terms: 9n + -12n = -3n 15 + -3n = 12n + -12n Combine like terms: 12n + -12n = 0 15 + -3n = 0 Add '-15' to each side of the equation. 15 + -15 + -3n = 0 + -15 Combine like terms: 15 + -15 = 0 0 + -3n = 0 + -15 -3n = 0 + -15 Combine like terms: 0 + -15 = -15 -3n = -15 Divide each side by '-3'. n = 5 Simplifying n = 5
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