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Simplifying 21 = 5 + 2n Solving 21 = 5 + 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 + -2n = 5 + 2n + -2n Combine like terms: 2n + -2n = 0 21 + -2n = 5 + 0 21 + -2n = 5 Add '-21' to each side of the equation. 21 + -21 + -2n = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -2n = 5 + -21 -2n = 5 + -21 Combine like terms: 5 + -21 = -16 -2n = -16 Divide each side by '-2'. n = 8 Simplifying n = 8
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