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Simplifying -21 + -4n = -21 + -21n Add '21' to each side of the equation. -21 + 21 + -4n = -21 + 21 + -21n Combine like terms: -21 + 21 = 0 0 + -4n = -21 + 21 + -21n -4n = -21 + 21 + -21n Combine like terms: -21 + 21 = 0 -4n = 0 + -21n -4n = -21n Solving -4n = -21n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21n' to each side of the equation. -4n + 21n = -21n + 21n Combine like terms: -4n + 21n = 17n 17n = -21n + 21n Combine like terms: -21n + 21n = 0 17n = 0 Divide each side by '17'. n = 0 Simplifying n = 0
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