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Simplifying -21 = 7n + -4n Combine like terms: 7n + -4n = 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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