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Simplifying (n + 7) = 3n + 21 Reorder the terms: (7 + n) = 3n + 21 Remove parenthesis around (7 + n) 7 + n = 3n + 21 Reorder the terms: 7 + n = 21 + 3n Solving 7 + n = 21 + 3n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-3n' to each side of the equation. 7 + n + -3n = 21 + 3n + -3n Combine like terms: n + -3n = -2n 7 + -2n = 21 + 3n + -3n Combine like terms: 3n + -3n = 0 7 + -2n = 21 + 0 7 + -2n = 21 Add '-7' to each side of the equation. 7 + -7 + -2n = 21 + -7 Combine like terms: 7 + -7 = 0 0 + -2n = 21 + -7 -2n = 21 + -7 Combine like terms: 21 + -7 = 14 -2n = 14 Divide each side by '-2'. n = -7 Simplifying n = -7
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