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Simplifying 21 + -1n = -12 Solving 21 + -1n = -12 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 = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -1n = -12 + -21 -1n = -12 + -21 Combine like terms: -12 + -21 = -33 -1n = -33 Divide each side by '-1'. n = 33 Simplifying n = 33
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