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Simplifying 21 + n = -4(7 + -1n) 21 + n = (7 * -4 + -1n * -4) 21 + n = (-28 + 4n) Solving 21 + n = -28 + 4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-4n' to each side of the equation. 21 + n + -4n = -28 + 4n + -4n Combine like terms: n + -4n = -3n 21 + -3n = -28 + 4n + -4n Combine like terms: 4n + -4n = 0 21 + -3n = -28 + 0 21 + -3n = -28 Add '-21' to each side of the equation. 21 + -21 + -3n = -28 + -21 Combine like terms: 21 + -21 = 0 0 + -3n = -28 + -21 -3n = -28 + -21 Combine like terms: -28 + -21 = -49 -3n = -49 Divide each side by '-3'. n = 16.33333333 Simplifying n = 16.33333333
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