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Simplifying n + -1(n + 1) + -1(n + 2) = -9 Reorder the terms: n + -1(1 + n) + -1(n + 2) = -9 n + (1 * -1 + n * -1) + -1(n + 2) = -9 n + (-1 + -1n) + -1(n + 2) = -9 Reorder the terms: n + -1 + -1n + -1(2 + n) = -9 n + -1 + -1n + (2 * -1 + n * -1) = -9 n + -1 + -1n + (-2 + -1n) = -9 Reorder the terms: -1 + -2 + n + -1n + -1n = -9 Combine like terms: -1 + -2 = -3 -3 + n + -1n + -1n = -9 Combine like terms: n + -1n = 0 -3 + 0 + -1n = -9 -3 + -1n = -9 Solving -3 + -1n = -9 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -1n = -9 + 3 Combine like terms: -3 + 3 = 0 0 + -1n = -9 + 3 -1n = -9 + 3 Combine like terms: -9 + 3 = -6 -1n = -6 Divide each side by '-1'. n = 6 Simplifying n = 6
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