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Simplifying 3 + -2(n + -9) = 9 Reorder the terms: 3 + -2(-9 + n) = 9 3 + (-9 * -2 + n * -2) = 9 3 + (18 + -2n) = 9 Combine like terms: 3 + 18 = 21 21 + -2n = 9 Solving 21 + -2n = 9 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 + -2n = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -2n = 9 + -21 -2n = 9 + -21 Combine like terms: 9 + -21 = -12 -2n = -12 Divide each side by '-2'. n = 6 Simplifying n = 6
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