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Simplifying 21 = 12 + n Solving 21 = 12 + 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. 21 + -1n = 12 + n + -1n Combine like terms: n + -1n = 0 21 + -1n = 12 + 0 21 + -1n = 12 Add '-21' to each side of the equation. 21 + -21 + -1n = 12 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = 12 + -21 -1n = 12 + -21 Combine like terms: 12 + -21 = -9 -1n = -9 Divide each side by '-1'. n = 9 Simplifying n = 9
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