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Simplifying 72 = -2(9 + -2n) 72 = (9 * -2 + -2n * -2) 72 = (-18 + 4n) Solving 72 = -18 + 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. 72 + -4n = -18 + 4n + -4n Combine like terms: 4n + -4n = 0 72 + -4n = -18 + 0 72 + -4n = -18 Add '-72' to each side of the equation. 72 + -72 + -4n = -18 + -72 Combine like terms: 72 + -72 = 0 0 + -4n = -18 + -72 -4n = -18 + -72 Combine like terms: -18 + -72 = -90 -4n = -90 Divide each side by '-4'. n = 22.5 Simplifying n = 22.5
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