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Simplifying -243 = -9(10 + n) -243 = (10 * -9 + n * -9) -243 = (-90 + -9n) Solving -243 = -90 + -9n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9n' to each side of the equation. -243 + 9n = -90 + -9n + 9n Combine like terms: -9n + 9n = 0 -243 + 9n = -90 + 0 -243 + 9n = -90 Add '243' to each side of the equation. -243 + 243 + 9n = -90 + 243 Combine like terms: -243 + 243 = 0 0 + 9n = -90 + 243 9n = -90 + 243 Combine like terms: -90 + 243 = 153 9n = 153 Divide each side by '9'. n = 17 Simplifying n = 17
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