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Simplifying (7n + -9) + (5x + 45) = 180 Reorder the terms: (-9 + 7n) + (5x + 45) = 180 Remove parenthesis around (-9 + 7n) -9 + 7n + (5x + 45) = 180 Reorder the terms: -9 + 7n + (45 + 5x) = 180 Remove parenthesis around (45 + 5x) -9 + 7n + 45 + 5x = 180 Reorder the terms: -9 + 45 + 7n + 5x = 180 Combine like terms: -9 + 45 = 36 36 + 7n + 5x = 180 Solving 36 + 7n + 5x = 180 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + 7n + -36 + 5x = 180 + -36 Reorder the terms: 36 + -36 + 7n + 5x = 180 + -36 Combine like terms: 36 + -36 = 0 0 + 7n + 5x = 180 + -36 7n + 5x = 180 + -36 Combine like terms: 180 + -36 = 144 7n + 5x = 144 Add '-5x' to each side of the equation. 7n + 5x + -5x = 144 + -5x Combine like terms: 5x + -5x = 0 7n + 0 = 144 + -5x 7n = 144 + -5x Divide each side by '7'. n = 20.57142857 + -0.7142857143x Simplifying n = 20.57142857 + -0.7142857143x
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