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Simplifying 7n + 21 = 9n + -3 Reorder the terms: 21 + 7n = 9n + -3 Reorder the terms: 21 + 7n = -3 + 9n Solving 21 + 7n = -3 + 9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-9n' to each side of the equation. 21 + 7n + -9n = -3 + 9n + -9n Combine like terms: 7n + -9n = -2n 21 + -2n = -3 + 9n + -9n Combine like terms: 9n + -9n = 0 21 + -2n = -3 + 0 21 + -2n = -3 Add '-21' to each side of the equation. 21 + -21 + -2n = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -2n = -3 + -21 -2n = -3 + -21 Combine like terms: -3 + -21 = -24 -2n = -24 Divide each side by '-2'. n = 12 Simplifying n = 12
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