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Simplifying -7 + 4(1 + -9n) = -21 -7 + (1 * 4 + -9n * 4) = -21 -7 + (4 + -36n) = -21 Combine like terms: -7 + 4 = -3 -3 + -36n = -21 Solving -3 + -36n = -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 + -36n = -21 + 3 Combine like terms: -3 + 3 = 0 0 + -36n = -21 + 3 -36n = -21 + 3 Combine like terms: -21 + 3 = -18 -36n = -18 Divide each side by '-36'. n = 0.5 Simplifying n = 0.5
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