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Simplifying (n + 21) = 2n + 23 Reorder the terms: (21 + n) = 2n + 23 Remove parenthesis around (21 + n) 21 + n = 2n + 23 Reorder the terms: 21 + n = 23 + 2n Solving 21 + n = 23 + 2n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-2n' to each side of the equation. 21 + n + -2n = 23 + 2n + -2n Combine like terms: n + -2n = -1n 21 + -1n = 23 + 2n + -2n Combine like terms: 2n + -2n = 0 21 + -1n = 23 + 0 21 + -1n = 23 Add '-21' to each side of the equation. 21 + -21 + -1n = 23 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = 23 + -21 -1n = 23 + -21 Combine like terms: 23 + -21 = 2 -1n = 2 Divide each side by '-1'. n = -2 Simplifying n = -2
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