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Simplifying -21 = 4(9n + 7) Reorder the terms: -21 = 4(7 + 9n) -21 = (7 * 4 + 9n * 4) -21 = (28 + 36n) Solving -21 = 28 + 36n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-36n' to each side of the equation. -21 + -36n = 28 + 36n + -36n Combine like terms: 36n + -36n = 0 -21 + -36n = 28 + 0 -21 + -36n = 28 Add '21' to each side of the equation. -21 + 21 + -36n = 28 + 21 Combine like terms: -21 + 21 = 0 0 + -36n = 28 + 21 -36n = 28 + 21 Combine like terms: 28 + 21 = 49 -36n = 49 Divide each side by '-36'. n = -1.361111111 Simplifying n = -1.361111111
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