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Simplifying 21(9 + w + 4n) = 0 Reorder the terms: 21(9 + 4n + w) = 0 (9 * 21 + 4n * 21 + w * 21) = 0 (189 + 84n + 21w) = 0 Solving 189 + 84n + 21w = 0 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-189' to each side of the equation. 189 + 84n + -189 + 21w = 0 + -189 Reorder the terms: 189 + -189 + 84n + 21w = 0 + -189 Combine like terms: 189 + -189 = 0 0 + 84n + 21w = 0 + -189 84n + 21w = 0 + -189 Combine like terms: 0 + -189 = -189 84n + 21w = -189 Add '-21w' to each side of the equation. 84n + 21w + -21w = -189 + -21w Combine like terms: 21w + -21w = 0 84n + 0 = -189 + -21w 84n = -189 + -21w Divide each side by '84'. n = -2.25 + -0.25w Simplifying n = -2.25 + -0.25w
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