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Simplifying 21 + -1n = 18 Solving 21 + -1n = 18 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1n = 18 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = 18 + -21 -1n = 18 + -21 Combine like terms: 18 + -21 = -3 -1n = -3 Divide each side by '-1'. n = 3 Simplifying n = 3
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