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Simplifying 6 + -9(1 + -7n) = -21 6 + (1 * -9 + -7n * -9) = -21 6 + (-9 + 63n) = -21 Combine like terms: 6 + -9 = -3 -3 + 63n = -21 Solving -3 + 63n = -21 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 + 63n = -21 + 3 Combine like terms: -3 + 3 = 0 0 + 63n = -21 + 3 63n = -21 + 3 Combine like terms: -21 + 3 = -18 63n = -18 Divide each side by '63'. n = -0.2857142857 Simplifying n = -0.2857142857
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