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Simplifying 3 + 7n = 87 + -5n Solving 3 + 7n = 87 + -5n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '5n' to each side of the equation. 3 + 7n + 5n = 87 + -5n + 5n Combine like terms: 7n + 5n = 12n 3 + 12n = 87 + -5n + 5n Combine like terms: -5n + 5n = 0 3 + 12n = 87 + 0 3 + 12n = 87 Add '-3' to each side of the equation. 3 + -3 + 12n = 87 + -3 Combine like terms: 3 + -3 = 0 0 + 12n = 87 + -3 12n = 87 + -3 Combine like terms: 87 + -3 = 84 12n = 84 Divide each side by '12'. n = 7 Simplifying n = 7
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