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Simplifying 90 + 90 + n + n + n + n = 720 Combine like terms: 90 + 90 = 180 180 + n + n + n + n = 720 Combine like terms: n + n = 2n 180 + 2n + n + n = 720 Combine like terms: 2n + n = 3n 180 + 3n + n = 720 Combine like terms: 3n + n = 4n 180 + 4n = 720 Solving 180 + 4n = 720 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-180' to each side of the equation. 180 + -180 + 4n = 720 + -180 Combine like terms: 180 + -180 = 0 0 + 4n = 720 + -180 4n = 720 + -180 Combine like terms: 720 + -180 = 540 4n = 540 Divide each side by '4'. n = 135 Simplifying n = 135
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