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Simplifying 21 = n + 21 Reorder the terms: 21 = 21 + n Add '-21' to each side of the equation. 21 + -21 = 21 + -21 + n Combine like terms: 21 + -21 = 0 0 = 21 + -21 + n Combine like terms: 21 + -21 = 0 0 = 0 + n 0 = n Solving 0 = n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 0 + -1n = n + -1n Remove the zero: -1n = n + -1n Combine like terms: n + -1n = 0 -1n = 0 Divide each side by '-1'. n = 0 Simplifying n = 0
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