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Simplifying 21 + n = 7(7n + 3) Reorder the terms: 21 + n = 7(3 + 7n) 21 + n = (3 * 7 + 7n * 7) 21 + n = (21 + 49n) Add '-21' to each side of the equation. 21 + -21 + n = 21 + -21 + 49n Combine like terms: 21 + -21 = 0 0 + n = 21 + -21 + 49n n = 21 + -21 + 49n Combine like terms: 21 + -21 = 0 n = 0 + 49n n = 49n Solving n = 49n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-49n' to each side of the equation. n + -49n = 49n + -49n Combine like terms: n + -49n = -48n -48n = 49n + -49n Combine like terms: 49n + -49n = 0 -48n = 0 Divide each side by '-48'. n = 0 Simplifying n = 0
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