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Simplifying -63 = 9(-9 + n) -63 = (-9 * 9 + n * 9) -63 = (-81 + 9n) Solving -63 = -81 + 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. -63 + -9n = -81 + 9n + -9n Combine like terms: 9n + -9n = 0 -63 + -9n = -81 + 0 -63 + -9n = -81 Add '63' to each side of the equation. -63 + 63 + -9n = -81 + 63 Combine like terms: -63 + 63 = 0 0 + -9n = -81 + 63 -9n = -81 + 63 Combine like terms: -81 + 63 = -18 -9n = -18 Divide each side by '-9'. n = 2 Simplifying n = 2
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