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Simplifying 3 + -2n = 21 + 7n Solving 3 + -2n = 21 + 7n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7n' to each side of the equation. 3 + -2n + -7n = 21 + 7n + -7n Combine like terms: -2n + -7n = -9n 3 + -9n = 21 + 7n + -7n Combine like terms: 7n + -7n = 0 3 + -9n = 21 + 0 3 + -9n = 21 Add '-3' to each side of the equation. 3 + -3 + -9n = 21 + -3 Combine like terms: 3 + -3 = 0 0 + -9n = 21 + -3 -9n = 21 + -3 Combine like terms: 21 + -3 = 18 -9n = 18 Divide each side by '-9'. n = -2 Simplifying n = -2
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