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Simplifying 15 + -4n = -21 Solving 15 + -4n = -21 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -4n = -21 + -15 Combine like terms: 15 + -15 = 0 0 + -4n = -21 + -15 -4n = -21 + -15 Combine like terms: -21 + -15 = -36 -4n = -36 Divide each side by '-4'. n = 9 Simplifying n = 9
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