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Simplifying 21 = 7(n + 6) Reorder the terms: 21 = 7(6 + n) 21 = (6 * 7 + n * 7) 21 = (42 + 7n) Solving 21 = 42 + 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. 21 + -7n = 42 + 7n + -7n Combine like terms: 7n + -7n = 0 21 + -7n = 42 + 0 21 + -7n = 42 Add '-21' to each side of the equation. 21 + -21 + -7n = 42 + -21 Combine like terms: 21 + -21 = 0 0 + -7n = 42 + -21 -7n = 42 + -21 Combine like terms: 42 + -21 = 21 -7n = 21 Divide each side by '-7'. n = -3 Simplifying n = -3
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