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Simplifying 87 = 7n + 5n + 3 Reorder the terms: 87 = 3 + 7n + 5n Combine like terms: 7n + 5n = 12n 87 = 3 + 12n Solving 87 = 3 + 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. 87 + -12n = 3 + 12n + -12n Combine like terms: 12n + -12n = 0 87 + -12n = 3 + 0 87 + -12n = 3 Add '-87' to each side of the equation. 87 + -87 + -12n = 3 + -87 Combine like terms: 87 + -87 = 0 0 + -12n = 3 + -87 -12n = 3 + -87 Combine like terms: 3 + -87 = -84 -12n = -84 Divide each side by '-12'. n = 7 Simplifying n = 7
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