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Simplifying 21 + -4n = 5(1 + -4n) 21 + -4n = (1 * 5 + -4n * 5) 21 + -4n = (5 + -20n) Solving 21 + -4n = 5 + -20n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '20n' to each side of the equation. 21 + -4n + 20n = 5 + -20n + 20n Combine like terms: -4n + 20n = 16n 21 + 16n = 5 + -20n + 20n Combine like terms: -20n + 20n = 0 21 + 16n = 5 + 0 21 + 16n = 5 Add '-21' to each side of the equation. 21 + -21 + 16n = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 16n = 5 + -21 16n = 5 + -21 Combine like terms: 5 + -21 = -16 16n = -16 Divide each side by '16'. n = -1 Simplifying n = -1
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