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Simplifying 85 = 21 + 4n Solving 85 = 21 + 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. 85 + -4n = 21 + 4n + -4n Combine like terms: 4n + -4n = 0 85 + -4n = 21 + 0 85 + -4n = 21 Add '-85' to each side of the equation. 85 + -85 + -4n = 21 + -85 Combine like terms: 85 + -85 = 0 0 + -4n = 21 + -85 -4n = 21 + -85 Combine like terms: 21 + -85 = -64 -4n = -64 Divide each side by '-4'. n = 16 Simplifying n = 16
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