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Simplifying 21 = N + 2N Combine like terms: N + 2N = 3N 21 = 3N Solving 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. 21 + -3N = 3N + -3N Combine like terms: 3N + -3N = 0 21 + -3N = 0 Add '-21' to each side of the equation. 21 + -21 + -3N = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3N = 0 + -21 -3N = 0 + -21 Combine like terms: 0 + -21 = -21 -3N = -21 Divide each side by '-3'. N = 7 Simplifying N = 7
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