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Simplifying 30 + -7n = 9 + -4n Solving 30 + -7n = 9 + -4n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '4n' to each side of the equation. 30 + -7n + 4n = 9 + -4n + 4n Combine like terms: -7n + 4n = -3n 30 + -3n = 9 + -4n + 4n Combine like terms: -4n + 4n = 0 30 + -3n = 9 + 0 30 + -3n = 9 Add '-30' to each side of the equation. 30 + -30 + -3n = 9 + -30 Combine like terms: 30 + -30 = 0 0 + -3n = 9 + -30 -3n = 9 + -30 Combine like terms: 9 + -30 = -21 -3n = -21 Divide each side by '-3'. n = 7 Simplifying n = 7
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