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Simplifying 30 + -4n = 9n + -9 Reorder the terms: 30 + -4n = -9 + 9n Solving 30 + -4n = -9 + 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. 30 + -4n + -9n = -9 + 9n + -9n Combine like terms: -4n + -9n = -13n 30 + -13n = -9 + 9n + -9n Combine like terms: 9n + -9n = 0 30 + -13n = -9 + 0 30 + -13n = -9 Add '-30' to each side of the equation. 30 + -30 + -13n = -9 + -30 Combine like terms: 30 + -30 = 0 0 + -13n = -9 + -30 -13n = -9 + -30 Combine like terms: -9 + -30 = -39 -13n = -39 Divide each side by '-13'. n = 3 Simplifying n = 3
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