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Simplifying -18 + 3n = 30 + -9n Solving -18 + 3n = 30 + -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. -18 + 3n + 9n = 30 + -9n + 9n Combine like terms: 3n + 9n = 12n -18 + 12n = 30 + -9n + 9n Combine like terms: -9n + 9n = 0 -18 + 12n = 30 + 0 -18 + 12n = 30 Add '18' to each side of the equation. -18 + 18 + 12n = 30 + 18 Combine like terms: -18 + 18 = 0 0 + 12n = 30 + 18 12n = 30 + 18 Combine like terms: 30 + 18 = 48 12n = 48 Divide each side by '12'. n = 4 Simplifying n = 4
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