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Simplifying 1620 = (n + -2) * 180 Reorder the terms: 1620 = (-2 + n) * 180 Reorder the terms for easier multiplication: 1620 = 180(-2 + n) 1620 = (-2 * 180 + n * 180) 1620 = (-360 + 180n) Solving 1620 = -360 + 180n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-180n' to each side of the equation. 1620 + -180n = -360 + 180n + -180n Combine like terms: 180n + -180n = 0 1620 + -180n = -360 + 0 1620 + -180n = -360 Add '-1620' to each side of the equation. 1620 + -1620 + -180n = -360 + -1620 Combine like terms: 1620 + -1620 = 0 0 + -180n = -360 + -1620 -180n = -360 + -1620 Combine like terms: -360 + -1620 = -1980 -180n = -1980 Divide each side by '-180'. n = 11 Simplifying n = 11

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